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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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Which of the following statements is correct

(1) The current in a photocell increases with increasing frequency of light

(2) The photocurrent is proportional to applied voltage

(3) The photocurrent increases with increasing intensity of light

(4) The stopping potential increases with increasing intensity of incident light

Subtopic:  Photoelectric Effect: Experiment |
 87%
From NCERT
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