Physics

Problem

Four metals P, Q, R and S have threshold frequencies

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

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

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

and

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

respectively. A monochromatic beam of frequency

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

and identical intensity is incident on each surface. Arrange the metals in the decreasing order of maximum kinetic energy of the emitted photoelectrons. a)

Q > P > R > S

P > R > Q > S

P > Q > R > S

Q > R > P > S

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