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%
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 |
 88%
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 |
 58%
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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