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Q. No.
In the photoelectric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. The corresponding stopping potential is:
1. 1.3 V
2. 0.5 V
3. 2.3 V
4. 1.8 V
In the photoelectric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. The corresponding stopping potential is:
1. 1.3 V
2. 0.5 V
3. 2.3 V
4. 1.8 V
Subtopic: Photoelectric Effect: Experiment |
74%
From NCERT
AIPMT - 2011
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Light of two different frequencies, whose photons have energies of \(1\) eV and \(2.5\) eV respectively, illuminates a metallic surface whose work function is \(0.5\) eV successively. The ratio of maximum speeds of emitted electrons will be:
1. \(1:2\)
2. \(1:1\)
3. \(1:5\)
4. \(1:4\)
1. \(1:2\)
2. \(1:1\)
3. \(1:5\)
4. \(1:4\)
Subtopic: Einstein's Photoelectric Equation |
75%
From NCERT
AIPMT - 2011
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Electrons used in an electron microscope are accelerated by a voltage of 25 kV. If the voltage is increased to 100 kV, then the de-Broglie wavelength associated with the electrons would:
1. decrease by 2 times
2. decrease by 4 times
3. increase by 4 times
4. increase by 2 times
Subtopic: De-broglie Wavelength |
74%
From NCERT
AIPMT - 2011
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A source S1 is producing 1015 photons per sec of wavelength 5000 Å. Another source S2 is producing 1.02×1015 photons per second of wavelength 5100 Å. Then, (power of S2)/(power of S1) is equal to:
1. 1.00
2. 1.02
3. 1.04
4. 0.98
Subtopic: Photoelectric Effect: Experiment |
75%
From NCERT
AIPMT - 2010
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The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having work function 5.01 eV, when ultraviolet light of 200 nm falls on it, must be:
1. 2.4 V
2. -1.2 V
3. -2.4 V
4. 1.2 V
Subtopic: Einstein's Photoelectric Equation |
61%
From NCERT
AIPMT - 2010
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Monochromatic light of wavelength 667 nm is produced by a helium-neon laser. The power emitted is 9mW. The number of photons arriving per second on average at a target irradiated by this beam is:
1. 9 x 1017
2. 3 X 1016
3. 9 x 1015
4. 3 X 1019
Subtopic: Photoelectric Effect: Experiment |
78%
From NCERT
AIPMT - 2009
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The figure shows a plot of photocurrent versus anode potential for a photosensitive surface for three different radiations. Which one of the following is a correct statement?
| 1. | Curves \(a\) and \(b\) represent incident radiations of different frequencies and different intensities. |
| 2. | Curves \(a\) and \(b\) represent incident radiation of the same frequency but of different intensities. |
| 3. | Curves \(b\) and \(c\) represent incident radiation of different frequencies and different intensities. |
| 4. | Curves \(b\) and \(c\) represent incident radiations of the same frequency having the same intensity. |
Subtopic: Photoelectric Effect: Experiment |
85%
From NCERT
AIPMT - 2009
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The number of photoelectrons emitted for the light of a frequency (higher than the threshold frequency 0) is proportional to:
1. -0
2. threshold frequency (0)
3. intensity of light
4. frequency of light ()
Subtopic: Photoelectric Effect: Experiment |
78%
From NCERT
AIPMT - 2009
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The work function of the surface of a photosensitive material is \(6.2\) eV. In which region does the wavelength of the incident radiation, for which the stopping potential is \(5\) V, lie?
1. ultraviolet region.
2. visible region.
3. infrared region.
4. X-ray region.
1. ultraviolet region.
2. visible region.
3. infrared region.
4. X-ray region.
Subtopic: Einstein's Photoelectric Equation |
52%
From NCERT
AIPMT - 2008
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In the phenomenon of electric discharge through gases at low pressure, the colored glow in the tube appears as a result of:
| 1. | excitation of electrons in the atoms |
| 2. | a collision between the atoms of the gas |
| 3. | collisions between the charged particles emitted from the cathode and the atoms of the gas |
| 4. | a collision between different electrons of the atoms of the gas |
Subtopic: Electron Emission |
69%
From NCERT
AIPMT - 2008
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