Light of wavelength λ strikes a photo-sensitive surface and electrons are ejected with kinetic energy E. If the kinetic energy is to be increased to 2 E , the wavelength must be changed to λ ′ . where

Question

TestHub · Accepted Answer

Here, E = 2 h c ​ − W 0 ​ and 2 E = λ ′ h c ​ − W 0 ​ ⇒ λ λ ′ ​ = 2 E + W 0 ​ E + W ​ ⇒ λ ′ = λ ( 2 + W 0 ​ / E 1 + W 0 ​ / E ​ ) Since ( 2 + W 0 ​ / E ) ( 1 + W 0 ​ / E ) ​ > 2 1 ​ So λ ′ > 2 λ ​

Physics - Sound Wave Question with Solution | TestHub

Options:

Doubts & Discussion