MCQOPTIONS
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MCQOPTIONS
This section includes 9 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. |
What is the unit for the coefficient of stimulated emission? |
| A. | s<sup>-2</sup> |
| B. | m<sup>3</sup> s<sup>-2</sup> |
| C. | J<sup> 1</sup> m<sup>3</sup> |
| D. | J<sup> 1</sup> m<sup>3</sup> s<sup>-2</sup> |
| Answer» E. | |
| 2. |
What is the unit of the coefficient of spontaneous emission? |
| A. | s<sup>-1</sup> |
| B. | s |
| C. | J<sup>-1</sup> |
| D. | J |
| Answer» B. s | |
| 3. |
If the frequency of emitted photon is 10 Hz, the ratio of Einstein s coefficient is _____________ |
| A. | 2.177 X 10<sup>-51</sup> |
| B. | 3.177 X 10<sup>-51</sup> |
| C. | 5.177 X 10<sup>-51</sup> |
| D. | 6.177 X 10<sup>-51</sup> |
| Answer» E. | |
| 4. |
The probability of spontaneous emission increases rapidly with the energy difference between the two states. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
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 | |
| 6. |
The correct expression for the rate of stimulated emission is _______________ |
| A. | R<sub>se</sub> = A<sub>21</sub>N<sub>2</sub> |
| B. | R<sub>se</sub> = A<sub>21</sub>uN<sub>2</sub> |
| C. | R<sub>se</sub> = B<sub>21</sub>N<sub>2</sub> |
| D. | R<sub>se</sub> = B<sub>21</sub>uN<sub>2</sub> |
| Answer» E. | |
| 7. |
Which of the following Einstein s coefficient represents spontaneous emission? |
| A. | A<sub>12</sub> |
| B. | A<sub>21</sub> |
| C. | B<sub>12</sub> |
| D. | B<sub>21</sub> |
| Answer» C. B<sub>12</sub> | |
| 8. |
What is the relationship between B21 and B12? |
| A. | B<sub>12</sub> > B<sub>21</sub> |
| B. | B<sub>12</sub> < B<sub>21</sub> |
| C. | B<sub>12</sub> = B<sub>21</sub> |
| D. | No specific relation |
| Answer» D. No specific relation | |
| 9. |
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} ) | |