# Energy of a Photon

#### jakey

1. The problem statement, all variables and given/known data

the energy of the photon is determined by which properties:
a)wavelength
b)intensity of the beam
c)speed of pgoton
d)polarization
e)frequency

2. Relevant equations

E=hf=hc/lambda

3. The attempt at a solution

My first answer to this problem is E)frequency because of the equation E=hf. but then again, i thought about the equation c=lambdaf wherein the wavelength and frequency are related. And i'm confused because I only need to select an answer. would wavelength affect a photon's energy or is it dependent on its color? thanks

#### Gib Z

Homework Helper
The wavelength of a photo would certainly effect its energy, just as frequency does! The question says "properties" so I don't see why you can't pick both.

#### The Bob

Hey there,
The question does state which properties so as far as I can see, you can select more than one answer. Does your original question say to state only one?

The Bob

http://en.wikipedia.org/wiki/Photon

P.S. I see someone got there just before I did. Sorry to repeat what's already been said.

Last edited:

#### jakey

Hey there,
The question does state which properties so as far as I can see, you can select more than one answer. Does your original question say to state only one?

The Bob

http://en.wikipedia.org/wiki/Photon

P.S. I see someone got there just before I did. Sorry to repeat what's already been said.
I'm not sure, it's just kinda weird because there are questions like:
energy in a coiled wire is stored as:
a)charge b) potential diff c) magnetic fiels d)both a and b e) both a and c

in this question there's a choice of both a and b/a and c which is not present there. obviously, for this question, the answer's e.

#### The Bob

If the formulae says it is both, which they do, then go for both.

The Bob

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