Question:medium

Find the number of photons emitted per second by a 25 watt source of monochromatic light of wavelength 6600AA. What is the photoelectric current assuming 3% efficiency for photoelectric effect?

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Photoelectric current depends on: I = e × (efficiency) × (photon rate) Higher intensity means more current, not higher energy electrons.
Updated On: Mar 19, 2026
  • \(\dfrac{25}{3}\times10^{19}\,\text{s}^{-1},\;0.4\,\text{A}\)
  • \(\dfrac{25}{4}\times10^{19}\,\text{s}^{-1},\;6.2\,\text{A}\)
  • \(\dfrac{25}{2}\times10^{19}\,\text{s}^{-1},\;0.8\,\text{A}\)
  • None of these
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The Correct Option is A

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