Physical Optics — Physics MCQs (Class 11)
Free chapter-wise Physics MCQs with answers for MDCAT, FSc and entry tests.
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#129 The energy of a photon of wavelength 600 nm is
A) \( 3.3 \times 10^{-19} \) J
B) \( 3.3 \times 10^{-20} \) J
C) \( 3.3 \times 10^{-21} \) J
D) \( 3.3 \times 10^{-22} \) J
#130 The momentum of a photon of wavelength 600 nm is
A) \( 1.1 \times 10^{-27} \) kg m/s
B) \( 1.1 \times 10^{-28} \) kg m/s
C) \( 1.1 \times 10^{-29} \) kg m/s
D) \( 1.1 \times 10^{-30} \) kg m/s
#131 The phenomenon of photoelectric effect can be explained by
A) Wave theory
B) Corpuscular theory
C) Quantum theory
D) Electromagnetic theory
#132 The work function of a metal is 2 eV. The threshold wavelength is
A) 620 nm
B) 6200 Å
C) Both A and B
D) Neither A nor B
#133 The stopping potential for photoelectrons depends on
A) Intensity of light
B) Frequency of light
C) Both intensity and frequency
D) Neither intensity nor frequency
#134 The maximum kinetic energy of photoelectrons depends on
A) Intensity of light
B) Frequency of light
C) Both intensity and frequency
D) Neither intensity nor frequency
#135 The number of photoelectrons emitted depends on
A) Intensity of light
B) Frequency of light
C) Both intensity and frequency
D) Neither intensity nor frequency
#136 The photoelectric current depends on
A) Intensity of light
B) Frequency of light
C) Both intensity and frequency
D) Neither intensity nor frequency
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