Physics

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

P<R<S<Q

R<P<S<Q

Q<S<P<R