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Question

The work function of a photoelectric material is 3.3 eV. It threshold frequency will be:


A
8×1014Hz
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B
8×1010Hz
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C
5×1033Hz
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D
4×1011Hz
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Solution

The correct option is A $$8 \times 10^{14} Hz$$
Threshold frequency :- frequency of minimum energy required to remove electron

$$work\;function = 3.3ev$$

$$f=\dfrac{3.3\times 1.6\times 10^{-19}J}{6.626\times 10^{-34}J-s}$$ 

  $$=0.8\times 10^{15}Hz$$

  $$=8\times10^{14}Hz$$



Chemistry

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