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Q. No.Which of the following is not the property of cathode rays?
| 1. | It produces a heating effect. |
| 2. | It does not deflect in the electric field. |
| 3. | It casts a shadow. |
| 4. | It produces fluorescence. |
Subtopic: Electron Emission |
68%
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AIPMT - 2002
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J.J. Thomson's cathode-ray tube experiment
demonstrated that:
demonstrated that:
| 1. | cathode rays are streams of negatively charged ions. |
| 2. | all the mass of an atom is essentially in the nucleus. |
| 3. | the emem of electrons is much greater than the emem of protons. |
| 4. | the emem ratio of the cathode ray particles changes when a different gas is placed in the discharge tube. |
Subtopic: Electron Emission |
55%
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AIPMT - 2003
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A monochromatic source of light emits 50 W50 W at a wavelength of 400 nm.400 nm. The number of photons emitted per second is approximately (take hc=1240 eV-nmhc=1240 eV-nm):
1. 10201020
2. 10251025
3. 1030
4. 1040
1. 10201020
2. 10251025
3. 1030
4. 1040
Subtopic: Particle Nature of Light |
82%
From NCERT
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A photo-cell is illuminated by a source of light, which is placed at a distance d from the cell. If the distance becomes d2, then the number of electrons emitted per second will be:
1. same
2. four times
3. two times
4. one-fourth
Subtopic: Photoelectric Effect: Experiment |
70%
From NCERT
AIPMT - 2001
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The maximum kinetic energy of the emitted photoelectrons in the photoelectric effect is independent of:
| 1. | the work function of material |
| 2. | the intensity of incident radiation |
| 3. | the frequency of incident radiation |
| 4. | the wavelength of incident radiation |
Subtopic: Photoelectric Effect: Experiment |
78%
From NCERT
NEET - 2023
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The wavelength of light in the visible region is about 550 nm (average wavelength) for yellow-green colour. Three materials with work functions are given as Al (4.28 eV), Cu (4.65 eV) and Na (2.75 eV). From which of these photosensitive materials, can you build a photoelectric device that operates with visible light?
1. Al
2. Cu
3. Na
4. none of the above
Subtopic: Photoelectric Effect: Experiment |
55%
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A metallic ball (work function: 2 eV) is irradiated with light consisting of photons of wavelength 200 nm. The ball has an initial charge, giving it a potential 1 V. Take the product of Planck's constant and velocity of light, hc as 1240 eV-nm. The final potential of the ball, when photoemission practically stops, is:
1. 2 V
2. 3.2 V
3. 4.2 V
4. 5.2 V
1. 2 V
2. 3.2 V
3. 4.2 V
4. 5.2 V
Subtopic: Photoelectric Effect: Experiment |
54%
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A fraction f of the incident energy in a beam of light of wavelength λ is absorbed by a metallic surface and causes photoemission. If the power of the beam falling on the surface is P, then the maximum photocurrent is (e is electronic charge, h is Planck's Constant, c is the velocity of light in vaccum):
| 1. | λPhcf | 2. | 2λPhcf |
| 3. | λPhcfe | 4. | 2λPhcfe |
Subtopic: Photoelectric Effect: Experiment |
57%
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A source of light is placed at a distance of 50 cm from a photocell and the stopping potential is found to be V0. If the distance between the light source and photocell is made 25 cm, the new stopping potential will be:
| 1. | V0/2 | 2. | V0 |
| 3. | 4V0 | 4. | 2V0 |
Subtopic: Photoelectric Effect: Experiment |
75%
From NCERT
NEET - 2013
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According to Einstein's photoelectric equation, the graph between the kinetic energy of photoelectrons ejected and the frequency of incident radiation is:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Einstein's Photoelectric Equation |
78%
From NCERT
AIPMT - 2004
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