The maximum kinetic energy of a photoelectron is when the wavelength of incident light is

PHYSICS · Single correct · A Level · Physics · Particles and radiation · Particles and radiation

Problem

The maximum kinetic energy of a photoelectron is

E

when the wavelength of incident light is

\lambda

. If the kinetic energy becomes four times when the wavelength is reduced to one-third, then the work function of the metal is (1)

\frac{3hc}{\lambda}

(2)

\frac{hc}{3\lambda}

(3)

\frac{hc}{\lambda}

(4)

\frac{hc}{2\lambda}