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Q. No.The work function of a metal is \(h\nu_0.\) Light of frequency \(\nu\) falls on this metal. The photoelectric effect will take place only if:
1. \(\nu\geq \nu_0\)
2. \(\nu>2\ \nu_0\)
3. \(\nu<\nu_0\)
4. \(\nu<\nu_0/2\)
Subtopic: Photoelectric Effect: Experiment |
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Level 1: 80%+
Hints
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 |
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Level 1: 80%+
Hints
Why does the wave theory of light fail to explain the photoelectric effect?
| 1. | The photoelectric effect does not occur if the frequency of light is below a certain threshold, regardless of its intensity. |
| 2. | The maximum kinetic energy of the emitted electrons is unaffected by the intensity of the radiation. |
| 3. | There is no observable time delay between the radiation striking the surface and the emission of electrons. |
| 4. | All of the above factors. |
Subtopic: Photoelectric Effect: Experiment |
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Level 1: 80%+
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As the intensity of incident light increases,
| 1. | photoelectric current increases. |
| 2. | photoelectric current decreases. |
| 3. | kinetic energy of emitted photoelectrons increases. |
| 4. | kinetic energy of emitted photoelectrons decreases. |
Subtopic: Photoelectric Effect: Experiment |
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Level 1: 80%+
Hints
A photosensitive plate has a threshold frequency which is in the range of blue light. It can also exhibit a photoelectric effect if illuminated by:
1. orange light
2. yellow light
3. green light
4. violet light
1. orange light
2. yellow light
3. green light
4. violet light
Subtopic: Photoelectric Effect: Experiment |
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Subtopic: Photoelectric Effect: Experiment |
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If the frequency of incident radiations is doubled, then which of the following will increase?
1. Kinetic energy of the electron
2. Photoelectric current
3. Stopping potential
4. Both (1) & (3)
Subtopic: Photoelectric Effect: Experiment |
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The figure below shows the variation of photocurrent \((i)\) with anode potential \((V).\) The three curves are due to:
| 1. | variation in the colour of light |
| 2. | variation in the frequency of light |
| 3. | variation in the intensity of light |
| 4. | variation in the photoelectric material |
Subtopic: Photoelectric Effect: Experiment |
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Which, of the following solid substances, will most likely show the photoelectric effect easily?
1. Potassium
2. Rubber
3. Plastic
4. Solid hydrogen
1. Potassium
2. Rubber
3. Plastic
4. Solid hydrogen
Subtopic: Photoelectric Effect: Experiment |
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Level 1: 80%+
Hints
The work function of a certain metal is \(3.3~\text{eV}.\) The threshold frequency for the same metal for photoelectric emission will be:
\((\text{take}~h=6.6\times 10^{-34}~ \text{J-s};~1~\text{eV}=1.6\times 10^{-19}~\text{J})\)
1. \(8.0\times10^{14} ~\text{Hz }\)
2. \(8.0\times10^{16}~\text{ Hz} \)
3. \(8.0\times10^{18} ~\text{Hz}\)
4. \(8.0\times10^{19}~ \text{Hz }\)
\((\text{take}~h=6.6\times 10^{-34}~ \text{J-s};~1~\text{eV}=1.6\times 10^{-19}~\text{J})\)
1. \(8.0\times10^{14} ~\text{Hz }\)
2. \(8.0\times10^{16}~\text{ Hz} \)
3. \(8.0\times10^{18} ~\text{Hz}\)
4. \(8.0\times10^{19}~ \text{Hz }\)
Subtopic: Photoelectric Effect: Experiment |
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