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%
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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 \(6000~\mathring{A}\) to \(4000~\mathring{A}\), 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 |
 77%
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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 |
 57%
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Work function of a metal is 2.1 eV. Which of the waves of the following wavelengths will be able to emit photoelectrons from its surface ?
(1) 4000 Å, 7500 Å                     

(2) 5500 Å, 6000 Å

(3) 4000 Å, 6000 Å                     

(4) None of these

Subtopic:  Electron Emission |
 52%
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The cathode of a photoelectric cell is changed such that the work function changes from W1 to W2 W2>W1. If the current before and after the change are I1 and I2, all other conditions remaining unchanged, then (assuming >W2) :

(1) I1= I2               

(2) I1I2

(3) I1>I2               

(4) I1<I2<2I1

Subtopic:  Electron Emission |
 63%
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A beam of light of wavelength \(\lambda\) and with illumination \(L\) falls on a clean surface of sodium. If \(N\) photoelectrons are emitted each with kinetic energy \(E\), then:
1. \(N \propto L \) and \(E \propto L \)
2. \(N \propto L \) and \(E \propto \frac{1}{\lambda}\)
3. \(N \propto \lambda\) and \(E \propto L \)
4. \(N \propto \frac{1}{\lambda}\) and \(E \propto \frac{1}{L}\)

Subtopic:  Electron Emission |
 82%
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