In photoelectric effect, the photoelectric current
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(a) depends both on intensity and frequency of incident beam (b) does not depend on frequency but depends only on intensity of incident beam (c) increases […]
Maximum kinetic energy of electrons emitted in photoelectric effect increases when
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(a) intensity of light is increased (b) light source is brought nearer the metal (c) frequency of light is decreased (d) […]
Energy of photon whose frequency is 10¹² MHz will be
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(a) 4.14×10³ KeV (b) 4.14×10² eV (c) 4.14×10³ MeV (d) 4.14×10³ eV
Correct Answer:
4.14×10³ eV
Explanation:
No explanation available. Be the […]
When radiation is incident on a photoelectron emitter, the stopping potential is found to be 9 volt. If e/m for the electron is 1.8×10¹¹ Ckg⁻¹, the maximum velocity of the ejected electrons is
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Photocells convert
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(a) heat energy into electrical energy (b) light energy into mechanical energy (c) thermal energy into mechanical energy (d) light energy into electrical energy
Correct Answer:
light energy into electrical […]
The number of photons of wavelength of 540 nm emitted per second by an electric bulb of power 100 W is (given h=6×10⁻³⁴ J-s)
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(a) 100 (b) 1000 (c) 3×10²⁰ (d) 3×10¹⁸
Correct […]
Maximum velocity of the photoelectron emitted by a metal is 1.8×10⁶ ms⁻¹. Take the value of specific charge of the electron is 1.8×10¹¹ C kg⁻¹. Then the stopping potential in volt is
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The additional energy that should be given to an electron to reduce its de-Broglie wavelength from 1nm to 0.5nm is
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(a) 2 times the initial kinetic energy (b) 3 times the initial […]
The Davisson- Germer experiment is the direct evidence of
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(a) particle nature of electrons (b) wave nature of electrons (c) wave nature of light (d) particle nature of light
Correct Answer:
wave […]
Photons of 5.5 eV energy fall on the surface of the metal emitting photoelectrons on maximum kinetic energy 4.0eV. The stopping voltage required for these electrons is
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(a) 4.0 V (b) 5.5 […]
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