A metallic surface has work function

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

Problem

2.5\,\text{eV}

. Two monochromatic radiations of equal intensity,

\lambda_1 = 350\,\text{nm}

and

\lambda_2 = 550\,\text{nm}

, are allowed to fall simultaneously on the surface. Which one of the following statements is correct? (a) Photoemission occurs only due to

\lambda_1

; the maximum kinetic energy of the emitted electrons is about

0.5\,\text{eV}

.},{ (b) No photoemission occurs because the photon energies of both radiations are less than the work function. (c) Photoemission occurs only due to

\lambda_1

; the maximum kinetic energy of the emitted electrons is about

1.0\,\text{eV}

. (d) Photoemission occurs due to both radiations, producing electrons with two distinct maximum kinetic energies.