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 |
 63%
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 \(3\times 10^{6}~\text{m/s}\). 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 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 |
 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) 2eVm                   

(2) 2eVm

(3) 2meV                 

(4) V22em

Subtopic:  Electron Emission |
 87%
From NCERT
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