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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 |
67%
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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 \(\frac{e}{m}\) of electrons is much greater than the \(\frac{e}{m}\) of protons. |
| 4. | the \(\frac{e}{m}\) ratio of the cathode ray particles changes when a different gas is placed in the discharge tube. |
Subtopic: Electron Emission |
54%
From NCERT
AIPMT - 2003
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A monochromatic source of light emits \(50~\text{W}\) at a wavelength of \(400~\text{nm}\). The number of photons emitted per second is approximately (Take \(\text{hc} = 1240~\text{eV-nm}\)):
1. \(10^{20}\)
2. \(10^{25}\)
3. \(10^{30}\)
4. \(10^{40}\)
1. \(10^{20}\)
2. \(10^{25}\)
3. \(10^{30}\)
4. \(10^{40}\)
Subtopic: Particle Nature of Light |
82%
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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 \(\dfrac{d}{2}\), 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%
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AIPMT - 2001
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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 |
Subtopic: Photoelectric Effect: Experiment |
77%
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 |
54%
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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 |
53%
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A fraction \(f\) of the incident energy in a beam of light of wavelength \(\lambda\) 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. \(\dfrac{\lambda{P}}{h c} f\)
2. \(\dfrac{2\lambda{P}}{h c} f\)
3. \(\dfrac{\lambda{P}}{h c} f e\)
4. \(\dfrac{2\lambda{P}}{h c} f e\)
1. \(\dfrac{\lambda{P}}{h c} f\)
2. \(\dfrac{2\lambda{P}}{h c} f\)
3. \(\dfrac{\lambda{P}}{h c} f e\)
4. \(\dfrac{2\lambda{P}}{h c} f e\)
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 \(V_0\). 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%
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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 |
77%
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AIPMT - 2004
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