MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which Einstein’s coefficient should be used in this case? |
| A. | A12 |
| B. | A21 |
| C. | B12 |
| D. | B21 |
| Answer» E. | |
| 2. |
What is the unit for the coefficient of stimulated emission? |
| A. | s-2 |
| B. | m3 s-2 |
| C. | J−1 m3 |
| D. | J−1 m3 s-2 |
| Answer» E. | |
| 3. |
What is the unit of the coefficient of spontaneous emission? |
| A. | s-1 |
| B. | s |
| C. | J-1 |
| D. | J |
| Answer» B. s | |
| 4. |
If the frequency of emitted photon is 10 Hz, the ratio of Einstein’s coefficient is _____________ |
| A. | 2.177 X 10-51 |
| B. | 3.177 X 10-51 |
| C. | 5.177 X 10-51 |
| D. | 6.177 X 10-51 |
| Answer» E. | |
| 5. |
The probability of spontaneous emission increases rapidly with the energy difference between the two states. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
Which law is used for achieving the relation between the Einstein’s coefficients? |
| A. | Heisenberg’s Uncertainty Principle |
| B. | Planck’s radiation law |
| C. | Einstein’s equation |
| D. | Quantum law |
| Answer» C. Einstein’s equation | |
| 7. |
The correct expression for the rate of stimulated emission is _______________ |
| A. | Rse = A21N2 |
| B. | Rse = A21uN2 |
| C. | Rse = B21N2 |
| D. | Rse = B21uN2 |
| Answer» E. | |
| 8. |
Which of the following Einstein’s coefficient represents spontaneous emission? |
| A. | A12 |
| B. | A21 |
| C. | B12 |
| D. | B21 |
| Answer» C. B12 | |
| 9. |
What is the relationship between B21 and B12? |
| A. | B12 > B21 |
| B. | B12 < B21 |
| C. | B12 = B21 |
| D. | No specific relation |
| Answer» D. No specific relation | |
| 10. |
Which of the following is the correct expression for the relation between Einstein’s coefficients A and B? |
| A. | \(\frac{8\pi v^3 h}{c^3}\) |
| B. | \(\frac{8\pi v^2 h}{c^3}\) |
| C. | \(\frac{8\pi v^2 h}{c^2}\) |
| D. | \(\frac{8\pi hv}{c^3}\) |
| Answer» B. \(\frac{8\pi v^2 h}{c^3}\) | |