Question

The number of photons emitted per second
by a 60 W source of monochromatic light of
wavelength 663 nm is (h = 6.63 x 10-34Js)
0 4x10-20
1.54x10
3x10-20
2x102​

Answer 1

Answer:

There r 2 ×10^29 photons are emitted per second