Q. No.The work functions of Caesium \((\mathrm{Cs})\), Potassium \((\mathrm{K})\) and Sodium \((\mathrm{Na})\) are \(2.14~\text{eV}\), \(2.30~\text{eV}\) and \(2.75~\text{eV}\) respectively. If incident electromagnetic radiation has an incident energy of \(2.20~\text{eV}\). which of these photosensitive surfaces may emit photoelectrons?
| 1. | \(\mathrm{Na}\) only | 2. | \(\mathrm{Cs}\) only |
| 3. | Both \(\mathrm{Na}\) and \(\mathrm{K}\) | 4. | \(\mathrm{K}\) only |
Subtopic: Photoelectric Effect: Experiment |
66%
From NCERT
NEET - 2023
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The maximum kinetic energy of the emitted photoelectrons in photoelectric effect is independent of:
1. work function of material
2. intensity of incident radiation
3. frequency of incident radiation
4. wavelength of incident radiation
1. work function of material
2. intensity of incident radiation
3. frequency of incident radiation
4. wavelength of incident radiation
Subtopic: Photoelectric Effect: Experiment |
78%
From NCERT
NEET - 2023
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In a photoelectric experiment, blue light is capable of ejecting a photoelectron from a specific metal while green light is not able to eject a photoelectron. Ejection of photoelectrons is also possible using light of the colour:
1. yellow
2. red
3. violet
4. orange
Subtopic: Photoelectric Effect: Experiment |
83%
From NCERT
NEET - 2022
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NEET 2023 - Target Batch - Aryan Raj Singh
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Light of a frequency of \(1.5\) times the threshold frequency is incident on a photosensitive material. What happens to the photoelectric current when the frequency is cut in half and the intensity is doubled?
| 1. | four times | 2. | one-fourth |
| 3. | zero | 4. | doubled |
Subtopic: Photoelectric Effect: Experiment |
54%
From NCERT
NEET - 2020
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NEET 2023 - Target Batch - Aryan Raj Singh
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The work function of the photosensitive material is \(4.0~\text{eV}\). The longest wavelength of light that can cause photoelectric emission from the substance is (approximately):
1. \(3100~\text{nm}\)
2. \(966~\text{nm}\)
3. \(31~\text{nm}\)
4. \(310~\text{nm}\)
Subtopic: Photoelectric Effect: Experiment |
73%
From NCERT
NEET - 2019
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NEET 2023 - Target Batch - Aryan Raj Singh
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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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NEET 2023 - Target Batch - Aryan Raj Singh
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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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NEET 2023 - Target Batch - Aryan Raj Singh
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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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NEET 2023 - Target Batch - Aryan Raj Singh
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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 |
86%
From NCERT
AIPMT - 2009
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NEET 2023 - Target Batch - Aryan Raj Singh
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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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NEET 2023 - Target Batch - Aryan Raj Singh
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