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Q. No.A photon of energy \(3.4\) eV is incident on a metal having a work function of \(2\) eV. The maximum K.E of photo-electrons is equal to:
1.
\(1.4\) eV
2.
\(1.7\) eV
3.
\(5.4\) eV
4.
\(6.8\) eV
Subtopic: Einstein's Photoelectric Equation |
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A photocell is receiving light from a source placed at a distance of \(1\) m. If the same source is placed at a distance of \(2\) m, then the ejected electron:
| 1. | moves with one-fourth of energy as that of the initial energy. |
| 2. | moves with one-fourth of momentum as that of the initial momentum. |
| 3. | will be half in number. |
| 4. | will be one-fourth in number. |
Subtopic: Electron Emission |
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The stopping potential for photoelectrons:
| 1. | does not depend on the frequency of the incident light. |
| 2. | does not depend upon the nature of the cathode material. |
| 3. | depends on both the frequency of the incident light and the nature of the cathode material. |
| 4. | depends upon the intensity of the incident light. |
Subtopic: Photoelectric Effect: Experiment |
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If in a photoelectric experiment, the wavelength of incident radiation is reduced from \(6000~\mathring{A}\) to \(4000~\mathring{A}\), then:
| 1. | The stopping potential will decrease. |
| 2. | The stopping potential will increase. |
| 3. | The kinetic energy of emitted electrons will decrease. |
| 4. | The value of the work function will decrease. |
Subtopic: Photoelectric Effect: Experiment |
75%
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The value of stopping potential in the following diagram is given by:
| 1. | \(-4\) V | 2. | \(-3\) V |
| 3. | \(-2\) V | 4. | \(-1\) V |
Subtopic: Photoelectric Effect: Experiment |
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The number of photo-electrons emitted per second from a metal surface increases when:
| 1. | The energy of incident photons increases. | 2. | The frequency of incident light increases. |
| 3. | The wavelength of the incident light increases. | 4. | The intensity of the incident light increases. |
Subtopic: Photoelectric Effect: Experiment |
81%
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The energy of a quanta of frequency \(10^{15}\) Hz and \(h = 6.6 \times 10^{-34}~\text{J-s}\) will be:
1. \(6.6\times 10^{-19}~\text{J}\)
2. \(6.6\times 10^{-12}~\text{J}\)
3. \(6.6\times 10^{-49}~\text{J}\)
4. \(6.6\times 10^{-41}~\text{J}\)
1. \(6.6\times 10^{-19}~\text{J}\)
2. \(6.6\times 10^{-12}~\text{J}\)
3. \(6.6\times 10^{-49}~\text{J}\)
4. \(6.6\times 10^{-41}~\text{J}\)
Subtopic: Particle Nature of Light |
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What is the momentum of a photon in an \(X\text-\)ray beam of \(10^{-10}\) meter wavelength?
| 1. | \(1.5 \times 10^{-23}~\text{kg-m/s}\) |
| 2. | \(6.6 \times 10^{-24}~\text{kg-m/s}\) |
| 3. | \(6.6 \times 10^{-44}~\text{kg-m/s}\) |
| 4. | \(2.2 \times 10^{-52}~\text{kg-m/s}\) |
Subtopic: De-broglie Wavelength |
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If the following particles are moving at the same velocity, then which among them will have the maximum de-Broglie wavelength?
1. Neutron
2. Proton
3. -particle
4. -particle
Subtopic: De-broglie Wavelength |
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A particle which has zero rest mass and non-zero energy and momentum must travel with a speed:
| 1. | Equal to \(c\), the speed of light in vacuum. |
| 2. | Greater than \(c\). |
| 3. | Less than \(c\). |
| 4. | Tending to infinity. |
Subtopic: De-broglie Wavelength |
76%
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