# Cathode rays are similar to visible light rays in that(1) They both can be deflected by electric and magnetic fields (2) They both have a definite magnitude of wavelength (3) They both can ionize a gas through which they pass (4) They both can expose a photographic plate

Subtopic:  Photoelectric Effect: Experiment |
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Electron volt is a unit of
(1) Potential

(2) Charge

(3) Power

(4) Energy

Subtopic:  Electron Emission |
73%
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In an electron gun, the electrons are accelerated by the potential V. If e is the charge and m is the mass of an electron, then the maximum velocity of these electrons will be

(1) $\frac{2\mathrm{eV}}{\mathrm{m}}$

(2) $\sqrt{\frac{2\mathrm{eV}}{\mathrm{m}}}$

(3) $\sqrt{\frac{2\mathrm{m}}{\mathrm{eV}}}$

(4) $\frac{{\mathrm{V}}^{2}}{2\mathrm{em}}$

Subtopic:  Electron Emission |
87%
From NCERT
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The idea of matter waves was given by
(1) Davisson and Germer

(2) de-Broglie

(3) Einstein

(4) Planck

Subtopic:  De-broglie Wavelength |
74%
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Waves are associated with matter only:

 1 When it is stationary. 2 When it is in motion with the velocity of light only. 3 When it is in motion with any velocity. 4 None of the above.

Subtopic:  De-broglie Wavelength |
57%
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The de-Broglie wavelength associated with the particle of mass m moving with velocity v is

(1) h/mv

(2) mv/h

(3) mh/v

(4) m/hv

Subtopic:  De-broglie Wavelength |
94%
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A photon, an electron, and a uranium nucleus all have the same wavelength. The one with the most energy:

(1) Is the photon

(2) Is the electron

(3) Is the uranium nucleus

(4) Depends upon the wavelength and the properties of the particle

Subtopic:  De-broglie Wavelength |
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A particle which has zero rest mass and non-zero energy and momentum must travel with a speed:
 1 Equal to $$c$$, the speed of light in vacuum. 2 Greater than $$c$$. 3 Less than $$c$$. 4 Tending to infinity.
Subtopic:  De-broglie Wavelength |
76%
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When the kinetic energy of an electron is increased, the wavelength of the associated wave will
(1) Increase

(2) Decrease

(3) Wavelength does not depend on the kinetic energy

(4) None of the above

Subtopic:  De-broglie Wavelength |
85%
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If the de-Broglie wavelengths for a proton and an alpha-particle are equal, then the ratio of their velocities will be:
1. $$4:1$$
2. $$2:1$$
3. $$1:2$$
4. $$1:4$$

Subtopic:  De-broglie Wavelength |
68%
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