The threshold frequency for a certain metal is

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

Problem

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

. Light of frequencies

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

and

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

are separately incident on the metal. What is the ratio of the maximum kinetic energies of the electrons emitted by these two radiations (

K_{\text{max,1}}:K_{\text{max,2}}

)? (a)

2:3

(b)

3:1

(c)

1:3

(d)

1:2