Author Question: A helium-neon laser emits red light having a wavelength of 6.4 10-7 m and a power of 0.5 mW. How ... (Read 219 times)

lracut11 · **on:** Jul 28, 2018

A helium-neon laser emits red light having a wavelength of 6.4 10-7 m and a power of 0.5 mW. How many photons are emitted each second?
a. 6.4 1038
b. 1.6 1021
c. 3.2 1025
d. 2.6 1018
e. 1.6 1015

Question 2

A solid state pulsed laser has an energy of 400 mJ per pulse. If its wavelength is 1.06 10-6 m, how many photons are in each pulse?
a. 2 1025
b. 2 1021
c. 3 1018
d. 6 1038
e. 2 1018