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NEET-XII-Physics

42: Photoelectric Effect and Wave Particle Duality

with Solutions - page 3
Qstn# iii-5 Prvs-QstnNext-Qstn
  • #5
    The photo current in an experiment on photoelectric effect increases if
    (a) the intensity of the source is increased
    (b) the exposure time is increased
    (c) the intensity of the source is decreased
    (d) the exposure time is decreased
    digAnsr:   a
    Ans : (a) the intensity of the source is increased
    When the intensity of the source is increased, the number of photons emitted from the source increases. As a result, a large number of electrons of the metal interact with these photons and hence, the number of electrons emitted from the metal increases. Thus, the photocurrent in an experiment of photoelectric effect increases. The photocurrent does not depend on the exposure time. Hence, option
    (a) is correct.
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