energy equation

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Tinisha 1G
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Joined: Fri Sep 28, 2018 12:17 am

energy equation

Postby Tinisha 1G » Wed Oct 17, 2018 4:53 pm

How do I know when to use just the equation E=hv or when to use E=(hc)/v to find the energy of a photon?

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Re: energy equation

Postby zoepamonag4C » Wed Oct 17, 2018 4:58 pm

did you mean E = hc/λ?

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Re: energy equation

Postby daniella_knight1I » Wed Oct 17, 2018 5:14 pm

You will know depending on the variables given. If the variables don't quite line up with the energy equation, most likely you will have to use the other one and see if that works. Also make sure you distinguish the variable the problem is asking for.

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Re: energy equation

Postby ariana_apopei1K » Wed Oct 17, 2018 5:19 pm

I think it depends on what the question already gives you data-wise. If one of the equations isn't possible to use because a specific data point isn't given, then switch to the other and see from there.

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Re: energy equation

Postby Javier_Ochoa_DIS_3J » Fri Oct 19, 2018 3:54 pm

The above poster is correct.

The equation you are looking for is E = hc/λ

λ = wave length
E = energy
h = Planck constant
c = speed of light

H and C will be provided in the information sheet in the test.

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