What is the energy of He⁺ electron in first orbit?
What is the energy of He⁺ electron in first orbit?
Options
(a) (40.8 eV) (b) (-52.2 eV) (c) (-54.4 eV) (d) (-13.6 eV)
Correct Answer:
(-54.4 eV)
Explanation:
No explanation available. Be the […]
Questions
If h is Planck’s constant, the momentum of a photon of wavelength 0.01 Å is
If h is Planck’s constant, the momentum of a photon of wavelength 0.01 Å is
Options
(a) 10⁻² h (b) h (c) 10² h (d) 10¹² h
Correct Answer:
10¹² h
Explanation:
No […]
If the velocity of an electron increases, then its de Broglie wavelength will
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
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
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
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
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
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
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
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 […]