The de-Broglie wavelength of an electron moving with a velocity 1.5×10⁸ ms⁻¹ is equal to that of a photon. The ratio of the kinetic energy of the electron to the energy of the photon is […]
Which of the following is or the property of a cathode ray
Options
(a) It casts shadows (b) It produces heating effect (c) It produces flourescence (d) It does not deflect in electric […]
what should be the velocity of an electron so that its momentum becomes equal to that of a photon of wavelength 5200 Å?
Options
(a) 700ms⁻¹ (b) 1000ms⁻¹ (c) 1400ms⁻¹ (d) 2800ms⁻¹
Correct […]
If particles are moving with same velocity, then maximum de Broglie wavelength will be for
Options
(a) Neutron (b) Proton (c) α-particle (d) β-particle
Correct Answer:
β-particle
Explanation:
No explanation available. Be the […]
When ultraviolet rays are incident on metal plate, then photoelectric effect does not occur. It occur by the incidence of
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(a) Radio-waves (b) Infra red rays (c) Green house effect (d) X-rays
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
Options
(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
Options […]
Photocells convert
Options
(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 […]
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