1. | Curves \(a\) and \(b\) represent incident radiations of different frequencies and different intensities. |
2. | Curves \(a\) and \(b\) represent incident radiation of the same frequency but of different intensities. |
3. | Curves \(b\) and \(c\) represent incident radiation of different frequencies and different intensities. |
4. | Curves \(b\) and \(c\) represent incident radiations of the same frequency having the same intensity. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn the given graph of the photoelectric experiment, the maximum energy of the emitted photoelectron will be:
1. | \(2\) eV | 2. | \(0\) eV |
3. | \(4\) eV | 4. | \(4\) J |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe figure shows different graphs between stopping potential \(V_0\) and frequency \(v\) for photosensitive surfaces of cesium, potassium, sodium, and lithium. The plots are parallel. Which of the following about their work function is correct?
1. | \((i) > (ii) > (iii) > (iv)\) |
2. | \((i)>(iii)>(ii)> (iv)\) |
3. | \((iv)>(iii)>(ii)> (i)\) |
4. | \((i)=(iii)>(ii)= (iv)\) |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIf stopping potential \(V_{0}\) is plotted versus frequency \(\nu\) in an experiment of the photoelectric effect, the graph as shown in the diagram is obtained. Then: (e is an electronic charge)
1. | \(\dfrac{b}{a}\) | Planck's constant =
2. | \(\dfrac{eb}{a}\) | Planck's constant =
3. | \(\dfrac{a}{b}\) | Planck's constant =
4. | \(\dfrac{ea}{b}\) | Planck's constant =
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAssertion (A): | The threshold frequency of the photoelectric effect supports the particle nature of sunlight. |
Reason (R): | If frequency of incident light is less than the threshold frequency, electrons are not emitted from metal surface. |
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. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAssertion (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. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAssertion (A): | When ultraviolet light is incident on a photocell, its stopping potential is V0 and the maximum kinetic energy of the photoelectrons is Kmax. When the ultraviolet light is replaced by X-rays, both V0 and Kmax increase. |
Reason (R): | Photoelectrons are emitted with a speed ranging from zero to a maximum value because of the range of frequencies present in the incident 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. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAssertion (A): | Stopping potential depends upon the frequency of incident light but is independent of the intensity of the light. |
Reason (R): | The maximum kinetic energy of the photoelectron is proportional to stopping potential. |
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. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAssertion (A): | The photoelectrons produced by a monochromatic light beam incident on a metal surface, have a spread in their kinetic energies. |
Reason (R): | The work function of the metal varies as a function of depth from the surface. |
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. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAssertion (A): | In a photoelectron emission the velocity of an electron ejected from near the surface is larger than that coming from the interior of metal. |
Reason (R): | The velocity of all ejected electrons will be zero. |
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. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology