In a photoelectric experiment for 4000 Å incident radiation, the potential difference to stop the ejection is 2 V. If the incident light is changed to 3000 Å, then the potential required to stop the ejection of electrons will be

(1) 2 V                     

(2) Less than 2 V

(3) Zero                   

(4) Greater than 2 V

Subtopic:  Einstein's Photoelectric Equation |
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Light of wavelength \(4000~\mathrm{\mathring{A}}\) is incident on a sodium surface for which the threshold wavelength of photoelectrons is \(5420~\mathrm{\mathring{A}}\). The work function of sodium is:
1. \(4.58\) eV
2. \(2.29\) eV
3. \(1.14\) eV
4. \(0.57\) eV

Subtopic:  Photoelectric Effect: Experiment |
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Photocell is a device to: 

(1) Store photons

(2) Measure light intensity

(3) Convert photon energy into mechanical energy

(4) Store electrical energy for replacing storage batteries

Subtopic:  Electron Emission |
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If the work function for a certain metal is 3.2×10-19 joule and it is illuminated with light of frequency 8×1014 Hz. The maximum kinetic energy of the photo-electrons would be h=6.63×10-34 Js

(a) 2.1×10-19 J              (b) 8.5×10-19 J 
(c) 5.3×10-19 J              (d) 3.2×10-19 J

Subtopic:  Einstein's Photoelectric Equation |
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The stopping potential for photoelectrons:

1. does not depend on the frequency of the incident light.
2. does not depend upon the nature of the cathode material.
3. depends on both the frequency of the incident light and the nature of the cathode material.
4. depends upon the intensity of the incident light.
Subtopic:  Photoelectric Effect: Experiment |
 72%
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The maximum wavelength of radiation that can produce photoelectric effect in a certain metal is 200 nm. The maximum kinetic energy acquired by electron due to radiation of wavelength 100 nm will be 
(1) 12.4 eV                     

(2) 6.2 eV

(3) 100 eV                     

(4) 200 eV

Subtopic:  Photoelectric Effect: Experiment |
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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 |
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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%
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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%
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