monochromatic light of wavelength 667 nm is produced by a helium neon laser. The power emitted is 9 mW. The number of photons arriving per sec on the average at a target irradiated bt this beam is:
As we discussed in concept
photon -
A packet or bundle of energy is called a photon
-
Power of EM wave is
N = number of photon arriving per second
=
N =
Option 1)
This option is correct.
Option 2)
This option is incorrect.
Option 3)
This option is incorrect.
Option 4)
This option is incorrect.