Question

When the ‘k’ corresponding to the free electron is doubled, its energy increases by a factor of

Answer 1

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answer

first of all we know Wavelength = h / mv  

if kinetic energy is double it is due to √2 times increase in velocity.

then the

wavelength! = h / √2mv

wavelenghth = 1/√2( h/ mv).

if u have any doubt then free to ask me