A clean potassium surface (threshold frequency ) is successively exposed to four…

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

Problem

A clean potassium surface (threshold frequency

\nu_{0}=5.0\times10^{14}\,\text{Hz}

) is successively exposed to four monochromatic radiations of identical intensity: P:

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

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

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

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

Arrange the radiations in the increasing order of the maximum kinetic energy of the photoelectrons. (a)

R<S<P<Q

(b)

P<R<S<Q

(c)

R<P<S<Q

(d)

Q<S<P<R