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

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

Problem

Four metals P, Q, R and S have threshold frequencies 5.0×1014 Hz5.0\times10^{14}\,\text{Hz}, 6.0×1014 Hz6.0\times10^{14}\,\text{Hz}, 7.0×1014 Hz7.0\times10^{14}\,\text{Hz} and 8.0×1014 Hz8.0\times10^{14}\,\text{Hz} respectively. A monochromatic beam of frequency 7.0×1014 Hz7.0\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>SQ > P > R > S (b) P>R>Q>SP > R > Q > S (c) P>Q>R>SP > Q > R > S (d) Q>R>P>SQ > R > P > S

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