The frequency of a 90 keV X-ray photon is [tex]2.175 \times 10^{19} \ Hz[/tex].
The frequency of an X-ray photon can be determined using the Planck-Einstein relation, which states that the energy of a photon is directly proportional to its frequency. The equation is:
E = h * f
where E is the energy of the photon, h is Planck's constant
([tex]6.626 \times 10^{-34}[/tex] J s), and f is the frequency of the photon.
To find the frequency of a 90 keV X-ray photon, we need to convert the energy from keV (kiloelectron volts) to joules, since the units of Planck's constant are in joule-seconds. We can do this by multiplying the energy in keV by the electron charge ([tex]1.602 \times 10^{-19 }[/tex]C) to convert it to joules:
90 keV * (1[tex]1.602 \times 10^{-19 }[/tex] C) = [tex]1.4428 \times 10^{-14}[/tex] J
Now we can use the Planck-Einstein relation to find the frequency:
E = h * f
f = E / h
f = [tex]1.4428 \times 10^{-14}[/tex] / ([tex]6.626 \times 10^{-34}[/tex] J s)
f =[tex]2.175 \times 10^{19}[/tex] Hz
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What volume, in liters, does 128 grams of O2 occupy at STP? A) 89.6 LB) 22.4 LC) 67.2 LD) 44.8 L
At STP, 128 grams of oxygen occupy an area of 89.6 liters.
option A
Simply put, the space occupied by a three-dimensional solid is its volume. Solids include a cube, a cuboid, a cone, a cylinder, or a sphere. Many shapes have different volumes.
Each three-dimensional item needs a certain amount of room. This area's volume has been calculated. The area filled by an item within the confines of three-dimensional space is referred to as its volume. The capacity of the thing is another name for it.
32 grams of oxygen make up 1 mole.
128 g / 32 g/mol = 128 g / mol of oxygen
= 4.0 mol O2
This has volume at standard temperature and pressure.
4.0 mol divided by 22.4 L/mol
= 89.6 L
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If the temperature is constant, what change in volume would cause the pressure of an enclosed gas to be reduced to one quarter of its original value?
Answer:
Explanation:
From ideal gas equation PV=nRT
n is the number of moles, R is the gas constant = 0.0821 atm•L/mol•K
Since temperature is constant, P1V1=P2V2
P1V1=P1/4*V2
V2=4V1
Volume of the gas must be increased 4 times
which unit would be most appropriate for measuring the volume of a rain drop?
Milliliters (ml) or cubic millimetres are the most suitable units for calculating a raindrop's volume (mm3).
Raindrops are quite tiny and usually have volumes between 0.1 and 0.5 millilitres. Small, precise volume measures like millilitres or cubic millimetres are ideal for measuring these volumes.
A raindrop's volume can change depending on its size and form, as well as external conditions like air pressure and temperature.
For measuring the volume of a single raindrop, units of volume such as litres or cubic metres are too vast and would not offer sufficient precision. Thus, the units that are best suited for measuring the volume of a raindrop are millilitres or cubic millimetres.
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why is the bohr atom described as a planetary model?
Answer:
the electrons circle around the nucleus
Explanation:
since you can see the electrons in their respective orbitals in the Bohr model it has been deemed the planetary model. Like how planets orbit the sun, electrons orbit the nucleus.
what is baking soda ph
10. What is the potential energy of a 3 kg ball that is up a hill of height 40 meters?
Answer:
1200J
Explanation:
m=3,h=40 while g= 10m/s^2
P.E=mgh
= 3 x 40 x10
=1200J
you research the star sirius and find that its spectral lines are blue-shifted. what does this tell you about sirius?
The correct option is C. This tells you that Sirius has a radial velocity that is toward us.
The star Sirius is part of the Canis Major constellation.. It is the brightest star in the night sky and is often referred to as the "Dog Star" due to its position in the constellation. It is a binary star system composed of a white main sequence star designated Alpha Canis Majoris and a faint white dwarf companion known as Sirius B. Sirius is a main sequence star and is estimated to be around twice as massive as the Sun and has a surface temperature of 9,940 K.This means that the star is moving closer to us, and its spectral lines are shifted to shorter wavelengths (the blue end of the spectrum). This implies that Sirius is moving faster than the stars around it and the light from the star is Doppler shifted toward the blue end of the spectrum.
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complete question:
You research the star Sirius and find that its spectral lines are blue shifted. What does this tell you about Sirius?
A. It has a transverse velocity that is toward us.
B. Its surface temperature is higher than that of the Sun.
C. It has a radial velocity that is toward us.
D. It has a radial velocity that is away from us.
E. It has a transverse velocity that is away from us.
A pot of water is being heated on the stovetop. The water molecules closest to the burner rise in the pot when they gain thermal energy. In 1–2 sentences, explain why the water rises.
Heat is transferred to the water. The water molecules which are in the pot become more active, and the temperature of the water rises.
What is the Kinetic energy?Kinetic energy is the energy of the objects which is present due to the motion of the object. Kinetic energy is proportional to the mass and velocity of the object. The SI unit of Kinetic energy is Joule (J).
The kinetic energy is possessed due to the motion of the particles. The kinetic energy is directly proportional to the temperature of objects. The kinetic energy of the particles increases with the rise in temperature of object or solution.
In the given situation, the pot of water is placed on the stove. Then, the heat is transferred to the water in pot. The water molecules will move faster with the rise in temperature of the water. The water molecules will have greater amount of kinetic energy due to increase in temperature.
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What is the potential energy of a puppy that weighs 18 N sitting in a high chair 2 m high?
A bullet of mass m1 is fired horizontally with a speed vo into the bob of a ballistic pendulum of mass m2. The pendulum consists of a bob attached to one end of a very light rod of length l. The rod is free to rotate about a horizontal axis through its other end. The bullet is stopped in the bob. Find the minimum vo such that the bob will swing through a complete circle
The minimum velocity vo required for the bob to swing through a complete circle is:
[tex]vo = \sqrt\frac{(m1v02 + m2v02 - m2g2l2)}{m1}[/tex]
Using conservation of energy, we can solve for the minimum velocity required for the bob to swing through a complete circle.
The total initial energy of the system is:
[tex]Ei =\frac{1}{2} m1v02 +\frac{1}{2} m2v02[/tex]
The total final energy of the system is:
[tex]Ef = \frac{1}{2} m2vf2 + mg2l2[/tex]
where vf is the velocity of the bob after the collision and g is the gravitational acceleration.
Equating the initial and final energy, we have:
[tex]\frac{1}{2}m1v02 +\frac{1}{2} m2v02 =\frac{1}{2}m2vf2 + mg2l2[/tex]
Solving for vf, we have:
[tex]vf = \sqrt{} \frac{(m1v02 + m2v02)}{m2 - g2l2}[/tex]
The minimum velocity required for the bob to swing through a complete circle is given by the expression:
[tex]vo = \sqrt \frac{(m2vf2 + mg2l2)}{m1}[/tex]
Substituting the expression for vf, we have:
[tex]vo = \sqrt{ \frac{(\frac{m2(m1v02 + m2v02)}{m2 - g2l2})}{m1}[/tex]
[tex]vo = \sqrt\frac {(m1v02 + m2v02 - m2g2l2)}{m1}[/tex]
Therefore, the minimum velocity vo required for the bob to swing through a complete circle is:
[tex]vo = \sqrt\frac{(m1v02 + m2v02 - m2g2l2)}{m1}[/tex]
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A metal conducting sphere of radius R holds a total charge Q. What is the surface charge density, sigma, on the outer surface of the conducting sphere?
[tex]O = Q/4PiR^{2}[/tex] is the surface charge density, sigma, on the outer surface of the conducting sphere.
The load per group of a double surface area is defined as surface charge density. It is a measurement of how much electric charge accumulates on a surface. It is represented by the symbol, and the SI unit is Coulombs for each square meter, abbreviated [tex]Cm^{2}[/tex].
A surface charge is a non-zero electric charge on a two-dimensional surface. These electric fields are constrained here on the 2-D surface, and the bias voltage on the surface is described by surface charge density, which is measured even in coulombs per square meter.
Surface charge density is defined in electromagnetism also as the quantity of electric charge per unit length, volume, or surface area. surface charge is inverse to the conductor radius of curvature.
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2 IS MOT A heater in an electrical circuit has a current of 5 A passing through it and a potentia difference of 240 V across it. What is the power of the heater in cents
Answer:
To calculate the power of the heater, we can use the formula:
Power = Current x Voltage
In this case, the current is 5 A and the voltage is 240 V, so we have:
Power = 5 A x 240 V
Power = 1200 watts
Explanation:
To convert watts to cents, we need to know the cost of electricity in cents per unit of energy (usually measured in kilowatt-hours, or kWh). For example, if the cost of electricity is 15 cents per kWh, then the cost of running a 1200 watt appliance for one hour would be:
1200 watts = 1.2 kilowatts
1.2 kilowatts x 1 hour = 1.2 kilowatt-hours
1.2 kilowatt-hours x 15 cents/kWh = 18 cents
So the cost of running this heater for one hour would be 18 cents, assuming a cost of 15 cents per kWh.
which kind of spectrum is produced by a white household incandescent lightbulb?
why would a baseball player see a baseball flying through the air before he hears the crack of the ball on the bat?
A baseball player see a baseball flying through the air before he hears the crack of the ball on the bat because the sound is made as the ball flies through the air. The eyes react faster than ears. Light moves faster than sound.
What are light waves ?The term light wave defined as the motion of light conceptualized as a wave, defined by such properties as reflection, refraction, and dispersion.
The light waves heavily traveled back from the sky, obtaining energy, and the sound waves traveled in a straight line, losing energy, making the sound to be delayed.
Thus, The eyes react faster than ears. Light moves faster than sound.
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How much force does an 80 kg astronaut exert on his chair while sitting at rest on the launch pad?
The astronaut exerts a force of approximately 784.8 Newtons on his chair while sitting at rest on the launch pad.
The force that an 80 kg astronaut exerts on his chair while sitting at rest on the launch pad is equal to his weight. This is because, in the absence of any other external forces, the only force acting on the astronaut-chair system is the force of gravity. which is given by:
force = mass x gravity
where the mass is 80 kg and the acceleration due to gravity is approximately 9.81 m/s^2.
Therefore, the force exerted by the astronaut on his chair is:
force = 80 kg x 9.81 m/s^2 = 784.8 N
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when is your potential energy and kinetic energy at the max at a swing
Potential energy is held in a swing when it is pulled to one side, and when it is released, it transforms into kinetic energy. The topmost position of it has the highest potential energy, whereas the bottommost position, where the kinetic energy is highest, has the lowest potential energy.
When does kinetic energy peak during a swing?The swing's bottom, where gravity's potential energy is at its lowest, has the most kinetic energy. The pendulum keeps swinging upward while slowing down and losing kinetic energy as well as potential energy from gravity.
Where does the potential energy peak during the swing?Some of the swing's potential energy transforms into kinetic energy as it descends. The swing's kinetic energy is at its highest since it is going at its fastest speed while it is at its lowest point.
Why is the extreme position where potential energy is greatest?When bob has the greatest displacement relative to its mean position in a basic pendulum, that is an extreme position. The potential energy of the bob is at its highest point and the kinetic energy is at its lowest point in this position. Acceleration and velocity are both zero when in an extreme posture.
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our friend of mass 110 kg can just barely float in fresh water. part a calculate her approximate volume
Our friend's approximate volume is approximately 0.110 m^3.
To calculate the approximate volume of our friend, we can use the fact that she can just barely float in fresh water. This means that her weight is equal to the buoyant force acting on her. The buoyant force is given by the equation:Buoyant force = density of water x volume of displaced water x gravity
Since our friend is just barely floating, the buoyant force is equal to her weight, which is 110 kg x 9.81 m/s^2 = 1079.1 N. The density of fresh water is approximately 1000 kg/m^3.Using these values, we can rearrange the equation to solve for the volume of displaced water:
Volume of displaced water = Buoyant force / (density of water x gravity)
Volume of displaced water = 1079.1 N / (1000 kg/m^3 x 9.81 m/s^2) ≈ 0.110 m^3
Therefore, our friend's approximate volume is approximately 0.110 m^3.
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how to convert 600 kg to lbs?
600 kilograms is equal to 1322.4 pounds.
While measuring weight, various units like kilograms (kg) and pounds (lbs) are some commonly used units of measurement of weights. In order to understand and do all the conversion of kilograms to pounds, it is very important to know that there are 2.20462 pounds which makes up one kilogram.
Formula used:
lbs = Kg x 2.204
lbs= 600 x 2.204
So, to convert 600 kilograms to pounds, there is a requirement of multiplying 600 to 2.20462. When this calculation is done, we obtain 1322.4 pounds.
In summary, to need to convert kilograms to pounds and thereafter, we simply need to multiply the number of kilograms by numerical value of 2.20462. 600 kg is equal to 881.848 pounds. 200 kg is equal to 440.924 pounds and consequently 300 kg is equal to 661.386 pounds.
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Explain key steps in correlative/causal relationships found within the passage.
When discussing a magnetic world, the author apparently wants readers to imagine that they are:
A.able to control the critical temperature.
B.possessors of magnets.
C.neutral observers.
D.magnets.
When discussing a magnetic world, the author apparently wants readers to imagine that they are D. Magnets.
The author in his book is trying to make the readers understand more about the magnet. This is how the author makes a correlative/causal relationships within the passage.
The author wants his readers to imagine if they are magnets, this is how they will be able to understand about the nature of the magnetic when the magnets are above the critical temperature. So, the option D is the correct answer to our question.
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how to find spring constant with time
To find the spring constant (k) using time, you need to perform an experiment that involves measuring the motion of an object attached to a spring.
Perform the experiment of spring attached to mass m. You will displace the object and measure the time it takes to complete one full oscillation or period (T). Using the equation k = (4π^2m)/T^2, where m is the mass of the object, you can calculate the spring constant.
Repeat the experiment for different masses to verify that the spring constant remains constant. This method assumes that the motion of the object is simple harmonic motion, which is valid for small oscillations around the equilibrium position. The calculated spring constant may not be accurate if the displacement is too large.
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Find the quantity of heat required to melt completely 200g of lead initially at 27°c given that for lead :melting point=0•14j/gk , specific latent heat of fusion=270j/g. If the heat is supplied to the lead at the rate of 30j/s, find the time taken to bring the lead to it's melting point. Find the additional time required to melt melt it.
It takes an additional 1,800 seconds (or 30 minutes) to melt the lead completely.
What is Time?
Time refers to the duration it takes to heat up the lead to its melting point and the duration it takes to melt the lead completely. It is a measure of the sequence of events or the period during which something occurs or exists. In this case, the time taken is measured in seconds and is used to calculate the amount of heat required to melt the lead and the time it takes to reach the melting point and complete the process of melting.
To find the quantity of heat required to melt completely 200g of lead initially at 27°C, we use the formula:
Q = m × L_f
Where Q is the quantity of heat, m is the mass of the substance, and L_f is the specific latent heat of fusion.
Given that the mass of lead is 200g, and the specific latent heat of fusion of lead is 270J/g, we can calculate the quantity of heat required to melt the lead as:
Q = 200g × 270J/g = 54,000J
To find the time taken to bring the lead to its melting point, we use the formula:
Q = m × c × ΔT
Where Q is the quantity of heat, m is the mass of the substance, c is the specific heat capacity of the substance, and ΔT is the change in temperature.
Since we want to bring the lead to its melting point, we need to calculate the temperature change required to do this. The melting point of lead is 327°C, so the temperature change required is:
ΔT = 327°C - 27°C = 300°C
The specific heat capacity of lead is 0.13J/gK, so we can calculate the quantity of heat required to bring the lead to its melting point as:
Q = 200g × 0.13J/gK × 300K = 7,800J
Since the heat is supplied to the lead at the rate of 30J/s, we can calculate the time taken to bring the lead to its melting point as:
t = Q / P
Where t is the time, Q is the quantity of heat required, and P is the power (rate of heat supply).
t = 7,800J / 30J/s = 260s
Therefore, it takes 260 seconds (or 4 minutes and 20 seconds) to bring the lead to its melting point.
To find the additional time required to melt the lead, we use the formula:
t = Q / P
Where Q is the quantity of heat required to melt the lead, and P is the power (rate of heat supply).
The quantity of heat required to melt the lead is 54,000J, so we can calculate the additional time required as:
t = 54,000J / 30J/s = 1,800s
Therefore, it takes an additional 1,800 seconds (or 30 minutes) to melt the lead completely.
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Eve solves a linear equation. The final two steps of her work are shown.
7x+3.5 = 7x-3.5
3.5 = -3.5
Answer:
the 3rd option
Explanation:
3.5 = -3.5
is false in every case, for any value of x we can think of.
there is no value of x that makes this equation true.
so, there is no solution.
which type of bell interacts more with high-pitched sounds?
According to the given information Small type of bell interacts more with high-pitched sounds.
What is high pitched and low pitch sound?High pitch sounds are those that have a high frequency. Shouts are frequently of rather high pitch. A whistle, for instance, appears to have a high pitch. Sounds with a low frequency rate have a low pitch.
How do you find high pitch sound?Downloading a sound level software would be the simplest approach to find out how loud this whining sound is (most are free). You want an app that measures both frequency (Hz) and decibel level simultaneously, while others simply measure decibel level (loudness). one which assesses both.
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In one sentence describe how modeling is used in science
Answer:
Modeling is used in science to simplify complex systems and phenomena, allowing scientists to make predictions and test hypotheses.
Explanation:
During a hot shower, water vapor fogs up the cooler mirror when it turns to water. this is an example of _____.
Answer:
condensation
Explanation:
During a hot shower, the water vapor condenses on the cooler mirror, causing it to fog up. This is an example of condensation, which is the process by which a gas or vapor turns into a liquid when it comes into contact with a cooler surface. The water vapor in the air is at a high temperature, but when it comes into contact with the cooler surface of the mirror, it loses heat energy and transitions back into its liquid state. This phenomenon can also be observed when dew forms on the grass in the early morning or when water droplets form on the outside of a cold drink on a hot day.
Coulomb's law is similar to Newton's law of gravitation in several ways. Which one of the statements is not a similarity between these two laws?
a) In both laws, the force is inversely proportional to the square of the distance between two particles.
b) In both laws, the force decreases with increasing distance between the two particles.
c) In both laws, the force is proportional to the product of an intrinsic property of each of the two particles.
d) In both laws, the force is always one of attraction between the two particles.
e) In both laws, there is a proportionality constant that appears.
Out of the given statements, the statement which is not a similarity between these two laws is the force is always one of attraction between the two particles. Correct option is C.
Both Coulomb's law and Newton's law of gravitation are inverse square laws.
Coulomb's law, mathematically, is given as, F = k q₁ q₂/r²
where,
F is the electric force
k is the coulomb's constant
q₁, q₂ are the charges
r is the distance
Newton's law of gravitation is mathematically given as, F = G m₁ m₂/r²
where,
F is the gravitational force
G is the gravitational constant
The masses of two objects are m₁, m₂.
r is the distance
The square of the distance between two particles and the force are inversely related in both equations.
The force in both laws diminishes as the distance between the two particles grows.
The force is inversely proportional to the product of an intrinsic characteristic of the two particles in both laws.
A proportionality constant can be found in both equations.
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As the sound propagates from one place to the other in air ,the air itself is not required to move from one place to the other
True, As the sound propagates from one place to the other in air ,the air itself is not required to move from one place to the other.
How does sound move from one location to another?
Parts of the medium that a sound is traveling through alternately compress and expand as it does so. According to science, sound is a vibration that moves through a transmission medium like a gas, liquid, or solid as an acoustic wave.
Therefore, only the energy of the moving particles is transferred during the creation of sound, not the actual particles themselves. Therefore, it is true that the air does not necessarily need to shift from one location to another in order for the sound wave to travel from one to the other.
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how many grams is in a quarter pounder
The one quarter pounder quantity will be equivalent to the approximately 113.4 grams.
A pound or pound-mass is a unit of mass or weight used in the British Imperial and American customary systems of measurement. It is also a unit of measure, 1 pound = 16 ounces. So one quarter pound equals 4 ounces. A gram is a unit of mass or weight in the International System of Units. Hence, both are units of mass or weight. We have to convert quater pounder in grams. To convert from one unit to another always a constant number is used which is called conversion factor. Now, ounces to grams, we can use the conversion factor that one ounce = 28.3495 grams.
So, to calculate required grams are in a quarter pound, we can multiply 4 ounces by the conversion factor, quarter pounder = 4 ounces × 28.3495 grams/ounce = 113.398 grams. Hence, the required value is approximately 113.4 grams.
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A 225-kg crate is pushed horizontally with a force of 710 N. If the coefficient of friction is 0.20, calculate the acceleration of the crate.
According to the questions the crate accelerates at a rate of 1.196 m/s2.
What is accelerate?The rate at which an object's velocity with respect to time changes is referred to as acceleration in mechanics. It is a vector quantity to accelerate. The direction of the net force exerted by an object determines the direction of its acceleration. A vehicle is said to be accelerating there in direction of travel when it begins at rest (zero velocity in an inertial frames of reference) and moves straight ahead at increasing speeds.
a = (F-mgμ)/m............ Equation 1
Where:
a = acceleration of the crate
m = mass of the crate
F = Force applied to the crate
μ = Coefficient of friction
From the question,
Given:
m = 225 kg
F = 710 N
g = 9.8 m/s²
μ = 0.20
Replace the aforementioned numbers in equation 1
a = [710-(225×9.8×0.20)]/225
a = (710-441)/225
a = 269/225
a = 1.196 m/s².
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what properties of the universe make it ""ready"" for life forms like you?
There are several key properties of the universe that make it "ready" for life forms like us. One of the most important is the abundance of carbon, which is essential for life as we know it.
Carbon is a versatile element that can form a wide variety of complex organic molecules, including the building blocks of proteins, DNA, and other essential biomolecules.
In addition to carbon, the universe also contains a wide range of other elements, including hydrogen, oxygen, nitrogen, and phosphorus, which are also crucial for life. The abundance of these elements is the result of processes such as stellar nucleosynthesis and supernova explosions, which occur throughout the universe.
The physical properties of the universe, such as its size, age, and rate of expansion, also play a role in making it "ready" for life. For example, the universe is large enough to contain a vast array of stars and galaxies, which provide the energy and raw materials necessary for life. At the same time, the universe is not too old or too young, which allows for the emergence of complex life forms within a reasonable timeframe.
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