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  • Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled?<div cl

Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled?

Option: 1

 doubled


Option: 2

 four times 


Option: 3

one-fourth

 


Option: 4

 zero


Answers (1)

best_answer

\\ \text{Frequency of light is 1.5 times of threshold frequency.}\\ \text{ Now frequency is made half.}\\ \text{So, new frequency will be}\ \frac{1.5 \mathrm{f}_{\mathrm{T}}}{2}=0.75 \mathrm{f}_{\mathrm{T}} \\ Since, \text{this frequency is less than threshold frequency So, there will not be ejection of electrons from the metal surface.} \\ \text{ So, there will not be any current.}

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Ritika Jonwal

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