The photoelectric threshold wavelength for a metal surface is 6600 Å. The work function for this is 
(1) 1.87 V                             

(2) 1.87 eV

(3) 18.7 eV                             

(4) 0.18 eV

Subtopic:  Photoelectric Effect: Experiment |
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Photoelectric effect was successfully explained first by
(1) Planck               

(2) Hallwash

(3) Hertz                 

(4) Einstein

Subtopic:  Photoelectric Effect: Experiment |
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A photocell is receiving light from a source placed at a distance of \(1\) m. If the same source is placed at a distance of \(2\) m, then the ejected electron:
1. moves with one-fourth of energy as that of the initial energy.
2. moves with one-fourth of momentum as that of the initial momentum.
3. will be half in number.
4. will be one-fourth in number.
Subtopic:  Electron Emission |
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In a photoelectric experiment for \(4000~\mathring{A}\) incident radiation, the potential difference to stop the ejection is \(2~\text{V}\). If the incident light is changed to \(3000~\mathring{A}\), then the potential required to stop the ejection of electrons will be:
1. \(2~\text{V}\)
2. Less than \(2~\text{V}\)
3. Zero
4. Greater than \(2~\text{V}\)
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 |
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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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