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Q. No.Ultraviolet photons, each of energy \(20~\text{eV},\) are incident onto a gas of \(\mathrm {H}\)-atoms, causing the emission of electrons. The kinetic energy of the emitted electrons has the value:
1. \(6.4~\text{eV}\)
2. \(7.2~\text{eV}\)
3. \(3.2~\text{eV}\)
4. \(13.6~\text{eV}\)
Subtopic: Electron Emission |
68%
From NCERT
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When two monochromatic lights of frequency, \(\nu\) and \(\dfrac{\nu}{2}\) are incident on a photoelectric metal, their stopping potential becomes \(\dfrac{V_{s}}{2}\) and \(V_s\), respectively. The threshold frequency for this metal is:
| 1. | \(\dfrac{3}{2} \nu\) | 2. | \(2\nu\) |
| 3. | \(3\nu\) | 4. | \(\dfrac{2}{3} \nu\) |
Subtopic: Einstein's Photoelectric Equation |
71%
From NCERT
NEET - 2022
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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 |
84%
From NCERT
NEET - 2022
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Given below are two statements:
| Assertion (A): | The work function of aluminium is \(4.2~\text{eV}\). Emission of electrons will not be possible if two photons, each of energy \(2.5~\text{eV}\), strike an electron of aluminium. |
| Reason (R): | For photoelectric emission, the energy of each photon should be greater than the work function of aluminium. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Photoelectric Effect: Experiment |
87%
From NCERT
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Given below are two statements:
| Assertion (A): | The photoelectric effect demonstrates the wave nature of light. |
| Reason (R): | The number of photoelectrons emitted is proportional to the frequency of light. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Particle Nature of Light |
76%
From NCERT
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The threshold frequency for a photosensitive metal is \(\nu_{0}\). When photons of frequency \(2\nu_{0}\) are incident on a photosensitive plate, the cut-off potential is \(V_{0}\). What will be the cut-off potential, when the light of frequency \(5\nu_{0}\) is incident on it?
1. \(V_{0}\)
2. \(2V_{0}\)
3. \(4V_{0}\)
4. \(5V_{0}\)
1. \(V_{0}\)
2. \(2V_{0}\)
3. \(4V_{0}\)
4. \(5V_{0}\)
Subtopic: Einstein's Photoelectric Equation |
81%
From NCERT
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Light of two different frequencies whose photons have energies \(1~\text{eV}\) and \(2.5~\text{eV}\) respectively, successively illuminate a metal whose work function is \(0.5~\text{eV}\). The ratio of the maximum speeds of the emitted electrons will be:
1. \(1:5\)
2. \(1:4\)
3. \(1:2\)
4. \(1:1\)
1. \(1:5\)
2. \(1:4\)
3. \(1:2\)
4. \(1:1\)
Subtopic: Einstein's Photoelectric Equation |
76%
From NCERT
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The ratio of wavelengths of proton and deuteron accelerated by potential \(V_{p}\) and \(V_{d}\) is \(1:\sqrt2.\) Then, the ratio of \(V_{p}\) to \(V_{d}\) will be:
1. \(1:1\)
2. \(\sqrt 2: 1\)
3. \(2:1\)
4. \(4:1\)
1. \(1:1\)
2. \(\sqrt 2: 1\)
3. \(2:1\)
4. \(4:1\)
Subtopic: De-broglie Wavelength |
From NCERT
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A nucleus of mass \(M,\) initially at rest, splits into two fragments with masses \(\dfrac{M'}{ 3}\) and \(\dfrac{2M'} { 3}\) \((M'<M).\) The ratio of the de-Broglie wavelengths of the two fragments is:
| 1. | \(1:2\) | 2. | \(2:1\) |
| 3. | \(1:1\) | 4. | \(2:3\) |
Subtopic: De-broglie Wavelength |
56%
From NCERT
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Two beams of monochromatic light of frequencies \(\nu_1\) and \(\nu_2,\) are incident on the surface of a photo-sensitive material. Photo electrons are emitted with maximum kinetic energies \(E_1\) and \(E_2,\) respectively. If the ratio \(E_1:E_2=1:n\), the cut-off frequency for the material is:
| 1. | \(\dfrac{n\nu_1+\nu_2}{n+1}\) | 2. | \(\dfrac{n\nu_1-\nu_2}{n-1}\) |
| 3. | \(\dfrac{n\nu_1-\nu_2}{n+1}\) | 4. | \(\dfrac{n\nu_1+\nu_2}{n-1}\) |
Subtopic: Einstein's Photoelectric Equation |
75%
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