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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 of electrons is much greater than the of protons. |
| 4. | the ratio of the cathode ray particles changes when a different gas is placed in the discharge tube. |
Subtopic: Electron Emission |
56%
From NCERT
AIPMT - 2003
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A monochromatic source of light emits at a wavelength of The number of photons emitted per second is approximately (take ):
1.
2.
3.
4.
1.
2.
3.
4.
Subtopic: Particle Nature of Light |
81%
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A photo-cell is illuminated by a source of light, which is placed at a distance from the cell. If the distance becomes , 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 |
71%
From NCERT
AIPMT - 2001
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The maximum kinetic energy of the emitted photoelectrons in the photoelectric effect is independent of the:
| 1. | work function of material |
| 2. | intensity of incident radiation |
| 3. | frequency of incident radiation |
| 4. | wavelength of incident radiation |
Subtopic: Photoelectric Effect: Experiment |
79%
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NEET - 2023
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The wavelength of light in the visible region is about nm (average wavelength) for yellow-green colour. Three materials with work functions are given as Al ( eV), Cu ( eV) and Na ( 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 |
56%
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A metallic ball (work function: eV) is irradiated with light consisting of photons of wavelength nm. The ball has an initial charge, giving it a potential V. Take the product of Planck's constant and velocity of light, hc as eV-nm. The final potential of the ball, when photoemission practically stops, is:
1. V
2. V
3. V
4. V
1. V
2. V
3. V
4. V
Subtopic: Photoelectric Effect: Experiment |
54%
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A fraction of the incident energy in a beam of light of wavelength is absorbed by a metallic surface and causes photoemission. If the power of the beam falling on the surface is , then the maximum photocurrent is:
( is electronic charge, is Planck's constant, is the velocity of light in vacuum)
( is electronic charge, is Planck's constant, is the velocity of light in vacuum)
| 1. | 2. | ||
| 3. | 4. |
Subtopic: Photoelectric Effect: Experiment |
56%
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A source of light is placed at a distance of cm from a photocell and the stopping potential is found to be . If the distance between the light source and photocell is made cm, the new stopping potential will be:
| 1. | 2. | ||
| 3. | 4. |
Subtopic: Photoelectric Effect: Experiment |
74%
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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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