When the light source is kept 20 cm away from a photo cell, stopping potential 0.6 V is obtained. When source is kept 40 cm away, the stopping potential will be 
1. 0.3 V                  2. 0.6 V
3. 1.2 V                  4. 2.4 V

Subtopic:  Photoelectric Effect: Experiment |
 74%
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The minimum energy required to remove an electron is called 
(1) Stopping potential               

(2) Kinetic energy

(3) Work function                     

(4) None of these

Subtopic:  Electron Emission |
 84%
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Assuming photoemission to take place, the factor by which the maximum velocity of the emitted photoelectrons changes when the wavelength of the incident radiation is increased four times, is 
(1) 4                       

(2) 14

(3) 2                       

(4) 12

Subtopic:  Electron Emission |
 53%
From NCERT
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If the work function of a metal is 'ϕ' and the frequency of the incident light is 'ν', there is no emission of photoelectron if
(1) v<ϕh                   

(2) v=ϕh   

(3) v>ϕh                   

(4) v>=ϕh   

Subtopic:  Electron Emission |
 75%
From NCERT
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Light of wavelength λ strikes a photo-sensitive surface and electrons are ejected with kinetic energy E. If the kinetic energy is to be increased to 2E, the wavelength must be changed to λ' where 
(1) λ'=λ2           

(2) λ'=2λ

(3) λ2<λ'<λ      

(4) λ'>λ

Subtopic:  Einstein's Photoelectric Equation |
 54%
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If in a photoelectric experiment, the wavelength of incident radiation is reduced from 6000 Å to 4000 Å, then:

1. The stopping potential will decrease.
2. The stopping potential will increase.
3. The kinetic energy of emitted electrons will decrease.
4. The value of the work function will decrease.

Subtopic:  Photoelectric Effect: Experiment |
 75%
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The photoelectric work function for a metal surface is 4.125 eV. The cut-off wavelength for this surface is

(1) 4125 Å                 

(2) 2062.5 Å

(3) 3000 Å                 

(4) 6000 Å

Subtopic:  De-broglie Wavelength |
 78%
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As the intensity of incident light increases,

1. photoelectric current increases.
2. photoelectric current decreases.
3. kinetic energy of emitted photoelectrons increases.
4. kinetic energy of emitted photoelectrons decreases.

Subtopic:  Photoelectric Effect: Experiment |
 85%
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Which of the following is dependent on the intensity of incident radiation in a photoelectric experiment

(1) Work function of the surface

(2) Amount of photoelectric current

(3) Stopping potential

(4) Maximum kinetic energy of photoelectrons

Subtopic:  Photoelectric Effect: Experiment |
 84%
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The maximum kinetic energy of photoelectrons emitted from a surface when photons of energy 6 eV fall on it is 4 eV. The stopping potential in volts is

(1) 2                     

(2) 4

(3) 6                     

(4) 10

Subtopic:  Electron Emission |
 56%
From NCERT
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