What Are the Formulas for Calculating Photon Momentum and Work Function?

[Procrastinate]

1. Is binding energy equivalent to work (W)?

2. A He-Ne gas laser produces monochromatic red ligth with a wavelength of 6.3 x 10^-7. If the beam is reflected normally from a mirror, what is the change in momentum of each photon on reflection?

I am particularly confused about this question. I used delta p = m(v - u) where v was the speed of light but it didn't result in the correct answer. Could anyone please give me a hint?

I also couldn't figure out what the mass of a photon was so I used the mass of an electron which I am sure is wrong.

 

[ZapperZ]

1. Is binding energy equivalent to work (W)?

Is this work, or "work function"?

2. A He-Ne gas laser produces monochromatic red ligth with a wavelength of 6.3 x 10^-7. If the beam is reflected normally from a mirror, what is the change in momentum of each photon on reflection?

I am particularly confused about this question. I used delta p = m(v - u) where v was the speed of light but it didn't result in the correct answer. Could anyone please give me a hint?

I also couldn't figure out what the mass of a photon was so I used the mass of an electron which I am sure is wrong.

You need to go back and find out the expression for the momentum of light. Hint: it is NOT p=mv!

Zz.

 

[Procrastinate]

Is this work, or "work function"?

Work function: E = W + KE



You need to go back and find out the expression for the momentum of light. Hint: it is NOT p=mv!

Zz.

1. I supposed binding energy many the threshold energy that was required to illuminate light.

2. Is it de Broglie's wavelength?: p = c/lambda

I didn't think it was this because the change in momentum is a different formula.