A metal has a threshold frequency of

PHYSICS · Subjective · CBSE · Physics · Dual Nature of Radiation and Matter · Dual Nature of Radiation and Matter

Problem

A metal has a threshold frequency of 5.0×1014 Hz5.0\times10^{14}\,\text{Hz}. Two monochromatic sources are used separately on this metal: (i) source A of frequency 8.0×1014 Hz8.0\times10^{14}\,\text{Hz}, and (ii) source B of frequency 1.2×1015 Hz1.2\times10^{15}\,\text{Hz}. (a) For each source, calculate the maximum kinetic energy of the emitted electrons in eV. (b) Which source produces the more energetic electrons and by how many electron-volts? (Take h=6.63×10−34 J sh = 6.63\times10^{-34}\,\text{J s}; 1 eV=1.6×10−19 J1\,\text{eV} = 1.6\times10^{-19}\,\text{J}.)

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