The threshold frequency v0 for a metal is 7.0×1014sec−1. Calculate the kinetic energy of an electron emitted when radiation of frequency. v=1.0×1015sec−1.
A
4.768×10−19 Joules
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B
2.6×10−19 Joules
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C
1.98×10−47 Joules
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D
1.98×10−19 Joules
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Solution
The correct option is B1.98×10−19 Joules According to Einstein's photoelectric equation,
Kinetic energy imported to the ejected electron is given by,
K.E=h×(ν−ν0)
ν=1×1015sec−1 is the frequency of incident light, ν0=7×1014sec−1 is the threshold frequency