## Energy of photon [ENDORSED]

$E=hv$

diana_calderon_4L
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### Energy of photon

When it comes to energy of a photon, there is a specific equation to calculate it right??

Chem_Mod
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### Re: Energy of photon

Yes, E = hv or E = hc/$\lambda$.

Catherine Kim 3K
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### Re: Energy of photon

Yes! You would use E=hv

g orloff 1J
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### Re: Energy of photon

use E=hv for energy of a photon

Henry_Phan_4L
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### Re: Energy of photon

Chem_Mod wrote:Yes, E = hv or E = hc/$\lambda$.

How did you get that second equation?

Yiting_Gong_4L
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### Re: Energy of photon

When would we use E=ch/wavelength instead of E=hv, vice versa?

ryanhon2H
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### Re: Energy of photon  [ENDORSED]

Henry_Phan_3B wrote:
Chem_Mod wrote:Yes, E = hv or E = hc/$\lambda$.

How did you get that second equation?

You substitute for v in E=hv to get E=hc/λ

Use the light equation c = vλ, solve for v to get v = c/λ, and substitute back into E=hv for v

NatBrown1I
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Joined: Fri Sep 28, 2018 12:17 am

### Re: Energy of photon

Depending on the specific variables that you have you can use either the equation:
E= hv
or
E = hc/ lambda

The second equation is just a combination of the first equation and lambda = c/v.

205458163
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### Re: Energy of photon

E=hv or you can get E=hc/λ from combine C=λv and E=hv.

Brian Kwak 1D
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### Re: Energy of photon

Like everyone stated before you would use both the equations C=λv and E=hv. It’s important to note that the equation with speed of light is only applicable to problems dealing with light. You can then reconfigure the equations to solve for the variable you are looking for.

Zachary Menz 1D
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### Re: Energy of photon

The method you use to calculate the energy of a photon depends on what the problem gives you. The equation for the energy of a photon E (energy of photon) = h (planck constant) * v (frequency). $c = \lambda v$ can be substituted into the previous equation if they give you values other than frequency.

Sisi Li 1F
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### Re: Energy of photon

You can use E=hv, or combine this with lamba=c/v to get E=hc/lambda

somyapanchal1D
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### Re: Energy of photon

Yes. In order to calculate the energy of a photon you use the equation E=hv.
E=energy of a photon in Joules
h=Planck's constant (6.626*10^-34 J*s)
v=frequency of wave in Hz