1. | \(\frac{1}{8}\) | 2. | \(\frac{3}{8}\) |
3. | \(\frac{5}{8}\) | 4. | \(\frac{7}{8}\) |
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. | \(2.2 \times 10^{-52}~\text{kg-m/s}\) |
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. |
1. | \(1.4\) eV | 2. | \(1.7\) eV |
3. | \(5.4\) eV | 4. | \(6.8\) eV |
The spectrum of radiation \(1.0\times 10^{14}\) Hz is in the infrared region.
The energy of one photon of this in joules will be:
1. \(6.62\times 10^{-48}\)
2. \(6.62\times 10^{-20}\)
3. \(\frac{6.62}{3}\times 10^{-28}\)
4. \(3\times 6.62\times 10^{-28}\)
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. |
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. |
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. |