If `I_(0)` is the threshold wavelength for photoelectric emission, 1 the wavelength of light falling on the surface of a metal and m is the mass of the electron, then the velocity of ejected electron is given by

Options

A. `[(2h)/m(lambda_0-lambda)]^(1//2)`
B. `[(2hc)/m(lambda_0-lambda)]^(1//2)`
C. `[(2hc)/m((lambda_0-lambda)/(lambda_0lambda))]^(1//2)`
D. `[(2h)/m(1/lambda_0-1/lambda)]^(1//2)`

Answer

C