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Standard XII
Physics
Question

Photoelectric effect supports quantum nature of light because
a) There is a minimum frequency of light below which no photoelectrons are emitted.
b) The maximum kinetic energy of photo electrons depends only on the frequency.
c) Even when the metal surface is faintly illuminated, the photoelectrons leave the surface immediately.
  1. a, b
  2. b, c
  3. a, c
  4. a, b, c

A
a, b
B
b, c
C
a, b, c
D
a, c
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Solution
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Photoelectric effect supports quantum nature of light because in photoelectric effect we assume that light is quantised, which carry small packets of energy so, it required minimum frequency to overcome the work function of the metal and maximum kinetic energy is dependent on the frequency of the incident light , and ejection of electrons from the surface takes place even in faintly illuminated metal surface.

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Q1
Photoelectric effect supports quantum nature of light because
a) There is a minimum frequency of light below which no photoelectrons are emitted.
b) The maximum kinetic energy of photo electrons depends only on the frequency.
c) Even when the metal surface is faintly illuminated, the photoelectrons leave the surface immediately.
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Q2
Photoelectric effect supports quantum nature of light because
(a) there is a minimum frequency below which no photoelectrons are emitted
(b) the maximum kinetic energy of photoelectrons depends only on the frequency of light and not on its intensity
(c) even when the metal surface is faintly illuminated the photoelectrons leave the surface immediately
(d) electric charge of the photoelectrons is quantised
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Q3
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Q4
When a metallic surface is illuminated by a light of frequency 8×1014 Hz, photoelectron of maximum energy 0.5 eV is emitted. When the same surface is illuminated by light of frequency 12×1014Hz, photoelectron of maximum energy 2 eV is emitted. The work function is
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Q5
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