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AP EAMCET201724 Apr 2017Evening ShiftPhysicsDual Nature of MatterActual

A point source of light emits photons of energy 4.8 eV at the rate 10^5 photons per second. These photons incident on a photo-sensitive sphere of work function 2.8 eV and radius 9 ~mm . The sphere is initially neutral and the emitted photo electrons are instantly swept away. The time after which the photo electric emission stops is

Options

  1. A250 ~s
  2. B125 ~s
  3. C375 ~s
  4. D175 ~s

Correct answer

B. 125 ~s

Step-by-step solution

No solution. Refer to answer key.

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