# A particle of mass $$1$$ mg has the same wavelength as an electron moving with a velocity of $$3\times 10^{6}~\text{m/s}$$. What will be the velocity of the particle? (mass of electrons = $$9.1\times 10^{-31}$$ kg) 1. $$2.7 \times 10^{-18} ~\text{ms}^{-1}$$ 2. $$9 \times 10^{-2} ~\text{ms}^{-1}$$ 3. $$3 \times 10^{-31}~\text{ms}^{-1}$$ 4. $$2.7 \times 10^{-21} ~\text{ms}^{-1}$$

Subtopic:  De-broglie Wavelength |
51%
From NCERT
NEET - 2008
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An electron  with an initial velocity v= is in an electric field E It's de Broglie wavelength at the time $t$ is given by:

(1) $\frac{{\lambda }_{0}}{\left(1+\frac{e{E}_{0}}{m}\frac{t}{{v}_{0}}\right)}$

(2) ${\lambda }_{0}\left(1+\frac{e{E}_{0}t}{m{v}_{0}}\right)$

(3) ${\lambda }_{0}$

(4)${\lambda }_{0}t.$

Subtopic:  De-broglie Wavelength |
64%
From NCERT
NEET - 2018
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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 |
From NCERT
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Electron volt is a unit of
(1) Potential

(2) Charge

(3) Power

(4) Energy

Subtopic:  Electron Emission |
73%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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 |
From NCERT
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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%
From NCERT
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