A clean metallic surface has a threshold frequency of

PHYSICS · Multi-part · A Level · Physics · Particles and radiation · Particles and radiation

Problem

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

. With monochromatic light of frequency

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

, the stopping potential recorded is

1.6\,\text{V}

. The same surface is now irradiated in two successive steps: (a) the frequency is increased by

20\%

of its original value, and (b) the resulting frequency is further increased by

30\%

of the original value. Take

e = 1.6\times10^{-19}\,\text{C}

. (i) Calculate the stopping potential after step (a). (ii) Calculate the final stopping potential after step (b). (iii) Find the overall percentage increase in the maximum kinetic energy compared with its initial value and express this final kinetic energy in joules.

Related theory

Einstein's Photoelectric Equation
Quantum Explanation of PE
Photoelectric effect
Dual Nature of Radiation and Matter
The photoelectric effect

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