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  • Light of wavelength  strikes a photosensitive surface and electrons are ejected with kinetic energy <img al

Light of wavelength \lambda strikes a photosensitive surface and electrons are ejected with kinetic energy E. If the KE is to be increased to 2K, the wavelength must be changed to \lambda ' where -

Option: 1

\lambda '=\lambda /2


Option: 2

\lambda '=2\lambda


Option: 3

\lambda '> \lambda


Option: 4

\frac{\lambda }{2}< \lambda '< \lambda


Answers (1)

best_answer

If wavelength becomes halved than maximum KE becomes more than double.

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