- 1(current)
Q. No.A source of light is placed at a distance of \(50\) cm from a photocell and the stopping potential is found to be \(V_0\). If the distance between the light source and photocell is made \(25\) cm, the new stopping potential will be:
| 1. | \(V_0 /2\) | 2. | \(V_0 \) |
| 3. | \(4V_0 \) | 4. | \(2V_0 \) |
Subtopic: Photoelectric Effect: Experiment |
74%
From NCERT
NEET - 2013
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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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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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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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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.
2.
3.
4.
Subtopic: Photoelectric Effect: Experiment |
67%
From NCERT
AIPMT - 2007
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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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- 1(current)
Q. No.
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