A radioactive nucleus of mass M emits a photon

of frequency ν and the nucleus recoils. The recoil

energy will be:

(1) h2ν2/2 Mc2

(2) zero

(3) hν

(4) Mc2-

Subtopic:  De-broglie Wavelength |
 51%
From NCERT
NEET - 2011
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Photoelectric emission occurs only when the incident light has more than a certain minimum 

1. wavelength

2. intensity

3. frequency

4. power

Subtopic:  Photoelectric Effect: Experiment |
 78%
From NCERT
NEET - 2011
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The threshold frequency for a photo-sensitive metal is 3.3×1014 Hz. If the light of frequency 8.2×1014 Hz is incident on this metal, the cut-off voltage for the photo-electric emission is nearly:

1. 2 V                                        2. 3 V

3. 5 V                                         4. 1 V

Subtopic:  Photoelectric Effect: Experiment |
 64%
From NCERT
NEET - 2011
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The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface having a work function of 5.01 eV when ultraviolet light of 200 nm falls on it is:

1. 2.4 V 2. - 1.2 V
3. - 2.4 V 4. 1.2 V
Subtopic:  Einstein's Photoelectric Equation |
 57%
From NCERT
NEET - 2010
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When monochromatic radiation of intensity I falls on a metal surface, the number of photoelectrons and their maximum kinetic energy are N and T respectively. If the intensity of radiation is 2I what is the number of emitted electrons and their maximum kinetic energy?

1. N and 2T 2. 2N and T
3. 2N and 2T 4. N and T
Subtopic:  Photoelectric Effect: Experiment |
 82%
From NCERT
NEET - 2010
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The figure shows a plot of photo current versus anode potential for a photo sensitive surface for three difference radiations. Which one of the following is a correct statement?

(1) Curves a and b represent incident radiations of different frequencies and different intensities

(2) Curves a and b represent incident radiations of same frequency but of different intensities 

(3) Curves b and c represent incident radiations of different frequencies and different intensities

(4) Curves b and c represent incident radiations of same frequency having same intensity 

Subtopic:  Photoelectric Effect: Experiment |
 83%
From NCERT
NEET - 2009
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A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of 3×106 ms-1. What will be the velocity of the particle? (mass of electrons = 9 . 1 × 10- 31 kg )

1. \(2.7 \times 10^{-18} \mathrm{~ms}^{-1}\)
2. \(9 \times 10^{-2} \mathrm{~ms}^{-1}\)
3. \(3 \times 10^{-31} \mathrm{~ms}^{-1}\)
4. \(2.7 \times 10^{-21} \mathrm{~ms}^{-1}\)

Subtopic:  De-broglie Wavelength |
 51%
From NCERT
NEET - 2008
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An electron mass m with an initial velocity v=v0i^ v0>0 is in an electric field E=-E0 i^E0=constant > 0. It's de Broglie wavelength at the time t is given by:

(1) λ01+eE0mtv0

(2) λ01+eE0tmv0

(3) λ0

(4)λ0t.

Subtopic:  De-broglie Wavelength |
 65%
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%
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