For silver metal, the threshold frequency vo is 1.12×1017 Hz. What is the maximum kinetic energy of photoelectrons produced by shining U. V. light of 15.0oA wavelength on the metal?
A
3.00×10−17 J
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B
5.8×10−17 J
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C
3.9×10−17 J
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D
2×10−15 J
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Solution
The correct option is B5.8×10−17 J We know that, v=cλ=3×108 m s−115×10−10 m=2×1017s−1
Applying Einstein's Photoelectric Equation, K.E.=hv−hvo=h(v−vo) =6.626×10−34(2×1017−1.12×1017) =5.8×10−17 J