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Threshold wavelength for photoelectric emission from a metal surface is 5200 Å. Photoelectrons will be emitted when this surface is illuminated with monochromatic radiation from
  • a)
    1 W IR lamp
  • b)
    50 W UV lamp
  • c)
    50 W IR lamp
  • d)
    10 W IR lamp
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Threshold wavelength for photoelectric emission from a metal surface i...
First calculate the threshold frequency for the given question it will be f = 5.26 × 10^15 sec inverse
and in electromagnetic spectrum value of frequency for ultraviolet rays lies between 10^14 to 10^16 hence option b is correct
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