A parallel beam of monochromatic light of wavelength 6620 A

Last updated: 6/10/2023

A parallel beam of monochromatic light of wavelength 6620 A striking a metal surface perpendicular has an intensity of 900 W m The number of photon striking the matal surface per unit area per second is O 3 x 1021 3 x 1019 4x1021 4x1019