- #1
timhunderwood
- 12
- 0
Hi I'm a student in school and I'm having a mental block on how to do this question. Could some give me a hint as to the principals I'm meant to consider /use.
Q) A red, 100mW, laser beam , wavelength 650nm, is incident normally on a perfectly black disk . Calculate the force on the disk.
I've never really had to relate photons to forces before. I tried consider change in momentum of photon is equal to impulse on black disk but that didn't work.
Thanks for the help
Q) A red, 100mW, laser beam , wavelength 650nm, is incident normally on a perfectly black disk . Calculate the force on the disk.
I've never really had to relate photons to forces before. I tried consider change in momentum of photon is equal to impulse on black disk but that didn't work.
Thanks for the help