A photocell employs a photo-electric effect to convert:

1. change in the frequency of light into a change in electric voltage.
2. change in the intensity of illumination into a change in photoelectric current.
3. change in the intensity of illumination into a change in the work function of the photocathode.
4. change in the frequency of light into a change in the electric current.

Subtopic:  Photoelectric Effect: Experiment |
 63%
From NCERT
AIPMT - 2006
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When photons of energy hν fall on an aluminium plate (of work function E0), photoelectrons of maximum kinetic energy K are ejected. If the frequency of the radiation is doubled, the maximum kinetic energy of the ejected photoelectrons will be:

1. K+E0

2. 2K

3. K

4. K+hν

Subtopic:  Einstein's Photoelectric Equation |
 55%
From NCERT
AIPMT - 2006
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The momentum of a photon of energy 1 MeV in kg m/s, will be:

1. 0.33×106

2. 7×10-24

3. 10-22

4. 5×10-22

Subtopic:  De-broglie Wavelength |
 58%
From NCERT
AIPMT - 2006
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An electron is accelerated through a potential difference of \(10,000~\text{V}\). Its de-Broglie wavelength is, (nearly):\(\left(m_e = 9\times 10^{-31}~\text{kg}\right )\)
1. \(12.2~\text{nm}\)
2. \(12.2\times 10^{-13}~\text{m}\)
3. \(12.2\times 10^{-12}~\text{m}\)
4. \(12.2\times 10^{-14}~\text{m}\)

Subtopic:  De-broglie Wavelength |
 73%
From NCERT
NEET - 2019
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Monochromatic light of frequency 6.0×1014 Hz is produced by a laser. The power emitted is 2×10-3 W. The number of photons emitted, on average, by the source per second is:

1. 5×1015

2. 5×1016

3. 5×1017

4. 5×1014

Subtopic:  Photoelectric Effect: Experiment |
 67%
From NCERT
AIPMT - 2007
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A 5 W emits monochromatic light of wavelength 5000 Å. When placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved 1.0 m away, the number of photoelectrons liberated is reduced by a factor of?

1. 4

2. 8

3.16

4. 2

Subtopic:  Electron Emission |
 71%
From NCERT
AIPMT - 2007
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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 |
 68%
From NCERT
AIPMT - 2008
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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.

Subtopic:  Einstein's Photoelectric Equation |
 53%
From NCERT
AIPMT - 2008
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The number of photoelectrons emitted for the light of a frequency ν (higher than the threshold frequency ν0) is proportional to:
1. ν -ν0
2. threshold frequency (ν0)
3. intensity of light
4. frequency of light (ν)
Subtopic:  Photoelectric Effect: Experiment |
 78%
From NCERT
AIPMT - 2009
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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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