Question Answers

Sahay Sir > Question Answers > MTG NEET Physics > Part 2 > Chapter 11 - Dual Nature of Radiation and Matter > One milliwatt of light of wavelength 4560 A is incident on a cesium surface of work function 1.9 ev. Given that quantum efficiency of photoelectric emission is 0.5 %. Planck’s constant h = 6.62 × 10^-34 J-s and velocity of light c = 3 × 10^8 ms^-1.

One milliwatt of light of wavelength 4560 A is incident on a cesium surface of work function 1.9 ev. Given that quantum efficiency of photoelectric emission is 0.5 %. Planck’s constant h = 6.62 × 10^-34 J-s and velocity of light c = 3 × 10^8 ms^-1.

Ultraviolet beam of wavelength 280 nm is incident on lithium surface of work function 2.5 eV. The maximum velocity of electron emitted from metal surface is