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Dual Nature of Radiation question

2006 · Shift 0 · Q99
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Dual Nature of Radiation question

2006 · Shift 0 · Q99

JEE MainPhysicsDual Nature of RadiationMCQ+4 / −1
The time taken by a photoelectron to come out after the photon strikes is approximately
  1. A
    10−4 s{10^{ - 4}}\,s10−4s
  2. B
    10−10 s{10^{ - 10}}\,s10−10s
  3. C
    10−16 s{10^{ - 16}}\,s10−16s
  4. D
    10−1 s{10^{ - 1}}\,s10−1s
View written solutionFree

Correct answer: B

  1. In the photoelectric effect, when a photon of sufficient frequency strikes the metal surface, the emission of the photoelectron is almost instantaneous.

  2. Experimental observations show that there is no appreciable time lag between the incidence of light and the emission of electrons.

  3. The time delay is of the order of about 10−10 s10^{-10}\text{ s}10−10 s or less in many textbook treatments for JEE-level questions.

  4. Now compare with the options:

  • A: 10−4 s10^{-4}\,\text{s}10−4s — too large
  • B: 10−10 s10^{-10}\,\text{s}10−10s — correct
  • C: 10−16 s10^{-16}\,\text{s}10−16s — not the standard JEE textbook value expected here
  • D: 10−1 s10^{-1}\,\text{s}10−1s — far too large
  1. Therefore, the correct option is 10−10 s\boxed{10^{-10}\,\text{s}}10−10s​ which corresponds to Option B.
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