Discussion :: Electronic Devices and Circuits
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Photo electric emission can occur only if
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A.
wave length of incident radiation is equal to threshold value
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B.
wave length of incident radiation is less than threshold value
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C.
frequency of incident radiation is less than threshold frequency
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D.
none of the above
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Answer : Option B
Explanation :
The frequency of incident radiation has to be more than threshold value. Wavelength is inversely proportional to frequency.
Therefore wavelength of incident radiation must be less than threshold value.
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