An electromagnetic wave of wavelength λ is incident on a photosensitive surface of negligible work function. If m mass is of photoelectron emitted from the surface has de-Broglie wavelength λ d , then

Question

An electromagnetic wave of wavelength λ is incident on a photosensitive surface of negligible work function. If m mass is of photoelectron emitted from the surface has de-Broglie wavelength λ d , then :NEET 2021

TestHub · Accepted Answer

From Einstein's equation, E i n c i d e n t = ϕ + k E m a x h f = 0 + 1 2 m v 2 h c λ = p 2 2 m ⇒ p = 2 m h c λ λ d = h p = h 2 m h c λ = λ h 2 m c ⇒ λ = 2 m c h λ d 2

Physics - Modern Physics Question with Solution | TestHub

Options:

Doubts & Discussion