- 1(current)
Q. No.| A. | The energy of a photon is \(E=h\nu.\) |
| B. | The velocity of a photon is \(c.\) |
| C. | The momentum of a photon, \(p={\dfrac{h\nu}{c}}.\) |
| D. | In a photon-electron collision, both total energy and total momentum are conserved. |
| E. | Photon possesses positive charge. |
1. \(\text {A, B, C}\) and \(\text {D}\) only
2. \(\text {A, C}\) and \(\text {D}\) only
3. \(\text {A, B, D}\) and \(\text {E}\) only
4. \(\text {A}\) and \(\text {B}\) only
The number of photons per second on an average emitted by a source of monochromatic light of wavelength \(600~\text{nm}\), when it delivers the power of \(3.3\times 10^{-3}\) watt will be:
\((h = 6.6\times10^{-34}~\text{J-s})\)
| 1. | \(10^{16}\) | 2. | \(10^{15}\) |
| 3. | \(10^{18}\) | 4. | \(10^{17}\) |
Radiation of energy \(E\) falls normally on a perfectly reflecting surface. The momentum transferred to the surface is:
(\(c\) = velocity of light)
1. \(E \over c\)
2. \(2E \over c\)
3. \(2E \over c^2\)
4. \(E \over c^2\)
A \(200~\text{W}\) sodium street lamp emits yellow light of wavelength \(0.6~\mu\text{m}\). Assuming it to be \(25\%\) efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is:
1. \(1.5\times 10^{20}\)
2. \(6\times 10^{18}\)
3. \(62\times 10^{20}\)
4. \(3\times 10^{19}\)
Which one among the following shows the particle nature of light?
| 1. | Photoelectric effect | 2. | Interference |
| 3. | Refraction | 4. | Polarisation |
- 1(current)
Q. No.
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