Homework Help: physics

Posted by maggie on Sunday, April 17, 2011 at 3:12pm.

Consider a single photon of red laser light, with wavelength of 633 nm (nano is 10-9).
What energy does this carry? What momentum? How does the energy compare to
typical atomic energies of a few times 10-19 J?

physics - drwls, Sunday, April 17, 2011 at 4:06pm
The energy is E = h*c/(wavelength)

The momentum is E/c = h/(wavelength)

h is Planck's constant, which you should know or look up. It has units of energy*time

The energy in a photon at that wavelength should be a few times 10^-19 J, or a few electron volts.

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