energy of photon
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energy of photon
Can we use E=hv to find the energy of a photon or do we need to use the E= work function + KE to find it?
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Re: energy of photon
Both are valid equations to find the energy of a photon. The one you use will depend on the information given during a specific problem. They can also be used together by doing hv = work function + KE
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Re: energy of photon
yes, you can use that equation to find the energy of the photon. Given frequency, you can plug it into E=hv, or if you are given wavelength, you can plug it into E=hc/lambda to find energy. you can also find the frequency or wavelength given energy using that equation, depending on what the problem gives you and you can rearrange the equation.
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Re: energy of photon
Yes that equation is to find the energy of a photon. However, like someone else said, what you use depends on what you are given and what the problem asks of you.
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Re: energy of photon
Either equation works! Depends on the given information, but often times E=hv is the one you're going to use. It's also a lot more straightforward in my opinion.
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Re: energy of photon
You can use either equation to find the energy of a photon, but I like to use E=hv because it's easier for me to plug things in and solve for. If you're given a frequency or wavelength you could use that one, but if you have key words like "how much energy is required to eject.." it'd remind me to use the other equation.
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Re: energy of photon
Either equation should work, but the E=hv equation can work for any instance whereas the one with the work function is only in the case where the photons are hitting a metal and ejecting electrons from it, so it's a more specific case.
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Re: energy of photon
You can use either one, but it depends on what information is given in the problem. If you know the frequency or wavelength use E=hv. The E= work function + KE equation is usually used when the electrons are being ejected and it asks you to calculate the energy required to eject them.
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Re: energy of photon
You can use both equations to find the energy of a photon, both individually and together. The equation that you will eventually use is more dependent on the information that you are given within your problem, rather than the outcome you are looking for.
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Re: energy of photon
Both can be used, it just depends on what you are given in a problem. If you are given the work function or the kinetic energy, it would be easier to use the second equation. But, if you are given the frequency, it would be easier to use the first.
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Re: energy of photon
Both equations, E = hv and Ephoton = work function + KE, can be used to find the Energy of a photon or the light. You would use each of these equations based on the information given. For example, if you were given the energy required to eject and electron and the left over kinetic/excess energy, you would use the E= work function + KE equation. However, if you were given the frequency or wavelength, you would use the E = hv equation. It all depends on what you are given.
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