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  4. If the work function of the photoelectric surface is 3.3 eV, then the value of threshold frequency is

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Q. If the work function of the photoelectric surface is 3.3 eV, then the value of threshold frequency is

MP PMTMP PMT 2010Dual Nature of Radiation and Matter

Solution:

E = h v
$ 3.3 \times 1.6 \times 10^{ - 19 } = 6.6 \times 10^{ - 34} \times v $
$ \Rightarrow v = \frac{ 3.3 \times 1.6 \times 10^{ - 19 } }{ 6.6 \times 10^{ - 34} } $
= 0.8 $ \times 10^{ 15 } $
$= 8 × 10^{14}\,Hz$