If the velocity of an electron increases, then its de Broglie wavelength will
Options
(a) Increase (b) Decrease (c) Remain the same (d) Become twice
Correct Answer:
Decrease
Explanation:
No explanation available. Be […]
If the radioactive dacay constant of radium is 1.07 x 10⁻⁴ year⁻¹, then its half-life is approximately
Options
(a) 8900 years (b) 7000 years (c) 6477 years (d) 5000 years
Correct Answer:
6477 […]
The electromagnetic theory of light failed to explain
Options
(a) Photoelectric effect (b) polarisation (c) diffraction interference (d)
Correct Answer:
Photoelectric effect
Explanation:
No explanation available. Be the first to write the […]
The Priniple of LASER action involves
Options
(a) Amplification of particular frequency emitted by the system (b) Population inversion (c) Stimulated emission (d) All of these
Correct Answer:
All of these
Explanation:
No […]
The time by a photoelectron to come out after the photon strikes is approximately
Options
(a) 10⁻¹ s (b) 10⁻⁴ s (c) 10⁻¹⁰ s (d) 10⁻¹⁶s
Correct Answer:
10⁻¹⁰ s
Explanation:
Emission of photo-electron […]
The momentum of a photon of energy 1 MeV in kg m/s will be
Options
(a) 5 x 10⁻²² (b) 0.33 x 10⁶ (c) 7 x10⁻²⁴ (d) 10⁻²²
Correct Answer:
5 x 10⁻²²
Explanation: […]
In a discharge tube ionization of enclosed gas is produced due to collisions between
Options
(a) Netural gas atoms/molecules (b) Positive ions and neutral atoms/molecules (c) Negative electrons and neutral atoms/molecules (d) Photons […]
We get Balmer series when electron comes from
Options
(a) Higher to 2nd orbit (b) 2nd to higher orbit (c) Higher to first orbit (d) None of these
Correct Answer:
Higher to 2nd […]
Which of the following are mechanical waves?
Options
(a) Light waves (b) Sound waves (c) X-rays (d) Ratio waves
Correct Answer:
Sound waves
Explanation:
No explanation available. Be the first to write the […]
The wavelength of the matter wave is independent of
Options
(a) Mass (b) Velocity (c) Momentum (d) Charge
Correct Answer:
Charge
Explanation:
No explanation available. Be the first to write the explanation for […]
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