momentum

melissajohn

Can someone please check over my solution and let me know if its right or wrong? Thank you.

question:calculate the momentum if the energy of photon is 25 x 10^5 erg?

solution:
2500000 Ergs = 0.25 Joules

p=E/c
(0.25 J)/(3*10^8 m/s)= 8.3*10^-10 J*s/m

alphysicist

Hi melissajohn,

That looks right to me.

melissajohn

ok thanks!... I wasn't sure if the answer was

= 8.3*10^-10 J*s/m

or 8.3*10^-10 Newton seconds

because of the units...

Mattowander

Newton seconds would probably be a more exact answer, even though it appears to me that that's the same as a Joule * s/m.