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Class 12 Physics
Dual Nature Of Radiation And Matter Chapter 11
Quiz 1
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Photons of frequency f is incident on a metal surface of threshold frequency f0 . The maximum K.E. of emitted photoelectrons is
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h(f + f0)
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hf0
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h(f - f0)
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hf
The photoelectric threshold frequency of a metal is fWhen light of frequency 4f0 is incident on the metal, the maximum K.E. of the emitted electron is
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2 hf0
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4 hf0
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3 hf0
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hf0/ 2
Sodium surface is illuminated by ultraviolet and visible radiation successively and the stopping potential determined. The stopping potential is
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Greater with visible light
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Equal in both cases
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Greater with ultraviolet light
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Infinite in both cases
Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material .If the frequency is halved and the intensity is doubled, the photoelectric current becomes
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Doubled
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Quadrupled
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Halved
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zero
Light of wavelength 4000 Ao is incident on a metal of work function 3.2 x 10-19 J. What is the maximum kinetic energy of the emitted electron?
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2.2 x 10-19 J
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1.75 x 10-19 J
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0.75 x 10-19 J
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1.1 x 10-19 J
Light from a bulb is falling on a wooden table but no photo electrons are emitted as
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Work function of wood is less
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Work function of wood is more
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It depends on the frequency
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It is independent of work function
Photons of energy 6 eV are incident on a potassium surface of a work function 2.1 eV. What is the stopping potential?
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-3.9V
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-8.1V
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-5V
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-1.9V
The energy of the incident photon is 20 eV and the work function of the photosensitive metal is 10 eV. What is the stopping potential?
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30 V
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5 V
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10 V
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15 V
Light of two different frequencies whose photons have energies of 1eV and 2.5 eV respectively successively illuminate a metal of work function 0.5eV. The ratio of maximum speed of emitted electrons is
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1:5
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1:4
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1:3
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1:2
A photosensitive material would emit electrons if exited by photons beyond a threshold. To cross the threshold, you would increase
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Frequency of light
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Wavelength of light
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Intensity of light
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Amplitude of light
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