Light of frequency is incident on a metallic surface whose threshold frequency is

PHYSICS · Subjective · A Level · Physics · Particles and radiation · Particles and radiation

Problem

Light of frequency

6.0\times10^{14}\,\text{Hz}

is incident on a metallic surface whose threshold frequency is

4.5\times10^{14}\,\text{Hz}

. The frequency of the light is then raised by

10\%

while the intensity is kept unchanged. Calculate the percentage change in the maximum kinetic energy of the emitted photo-electrons.