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:

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

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

(c) ${\lambda }_{0}$

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

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Cathode rays are similar to visible light rays in that

(a) They both can be deflected by electric and magnetic fields

(b) They both have a definite magnitude of wavelength

(c) They both can ionize a gas through which they pass

(d) They both can expose a photographic plate

Concept Questions :-

Photoelectric effect experiment
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Electron volt is a unit of
(a) Potential                         (b) Charge
(c) Power                             (d) Energy

Concept Questions :-

Electron emission
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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

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

(c) $\sqrt{\frac{2\mathrm{m}}{\mathrm{eV}}}$                  (d) $\frac{{\mathrm{V}}^{2}}{2\mathrm{em}}$

Concept Questions :-

Electron emission
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The idea of matter waves was given by
(a) Davisson and Germer                  (b) de-Broglie
(c) Einstein                                      (d) Planck

Concept Questions :-

De-broglie wavelength
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Wave is associated with matter

(a) When it is stationary
(b) When it is in motion with the velocity of light only
(c) When it is in motion with any velocity
(d) None of the above

Concept Questions :-

De-broglie wavelength
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The de-Broglie wavelength associated with the particle of mass m moving with velocity v is

(a) h/mv                 (b) mv/h
(c) mh/v                 (d) m/hv

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

A photon, an electron, and a uranium nucleus all have the same wavelength. The one with the most energy:

(a) Is the photon
(b) Is the electron
(c) Is the uranium nucleus
(d) Depends upon the wavelength and the properties of the particle

Concept Questions :-

De-broglie wavelength
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

A particle which has zero rest mass and non-zero energy and momentum must travel with a speed:

(a) Equal to c, the speed of light in vacuum

(b) Greater than c

(c) Less than c

(d) Tending to infinity

Concept Questions :-

Particle nature of light
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

When the kinetic energy of an electron is increased, the wavelength of the associated wave will
(a) Increase
(b) Decrease
(c) Wavelength does not depend on the kinetic energy
(d) None of the above

Concept Questions :-

De-broglie wavelength