Monochromatic light of frequency is incident normally on a clean cesium surface whose…

PHYSICS · Multi-part · CBSE · Physics · Dual Nature of Radiation and Matter · Dual Nature of Radiation and Matter

Problem

Monochromatic light of frequency 6.0×1014 Hz6.0\times10^{14}\,\text{Hz} is incident normally on a clean cesium surface whose threshold frequency is 5.2×1014 Hz5.2\times10^{14}\,\text{Hz}. Take h=6.63×10−34 J sh = 6.63\times10^{-34}\,\text{J\,s} and e=1.6×10−19 Ce = 1.6\times10^{-19}\,\text{C}. (i) Calculate the maximum kinetic energy of the emitted photo-electrons in electron-volt. (ii) Determine the stopping potential required to block the most energetic electrons.

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