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Dual Nature of Radiation and Matter question

2020 · Q134
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Dual Nature of Radiation and Matter question

2020 · Q134

NEETPhysicsDual Nature of Radiation and MatterMCQ+4 / −1
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?
  1. A
    four times
  2. B
    one-fourth
  3. C
    zero
  4. D
    doubled
View written solutionFree

Correct answer: C

v=32v0v = {3 \over 2}{v_0}v=23​v0​
and v′=v2=34v0{v'} = {v \over 2} = {3 \over 4}{v_0}v′=2v​=43​v0​
Here we see v′<v′<v0v' \lt v' \lt {v_0}v′<v′<v0​

Below threshold frequency, no photo-electric emission takes place.

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