MCQOPTIONS
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MCQOPTIONS
This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Physics Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The following graph is pictorial representation of _____________ |
| A. | Spontaneous emission |
| B. | Spontaneous Absorption |
| C. | Stimulated emission |
| D. | Stimulated Absorption |
| Answer» E. | |
| 2. |
For an ordinary light source, the coherence time t = 10-10s. The degree of Monochromaticity for a wavelength of 6000 Å is ___________ |
| A. | 0.1 X 10-4 |
| B. | 0.2 X 10-4 |
| C. | 0.3 X 10-4 |
| D. | 0.4 X 10-4 |
| Answer» C. 0.3 X 10-4 | |
| 3. |
Laser light from a 7mW source of aperture diameter 1.5 cm and wavelength 5000 Å is focused by a lens of focal length 10 cm. The intensity of the image is __________ |
| A. | 3 X 107 Wm-2 |
| B. | 4 X 107 Wm-2 |
| C. | 5 X 107 Wm-2 |
| D. | 6 X 107 Wm-2 |
| Answer» D. 6 X 107 Wm-2 | |
| 4. |
The output of a laser has pulse duration of 20 ms and average output power of 1.75 W per pulse. How much energy is released per pulse if wavelength is 5890 Å? |
| A. | 0.011 J |
| B. | 0.024 J |
| C. | 0.035 J |
| D. | 0.047 J |
| Answer» D. 0.047 J | |
| 5. |
The frequency of incident photon so that the atom makes a transition from E1 to E2 should be __________ |
| A. | E2 – E1 |
| B. | E2 – E1/c |
| C. | E2 – E1/h |
| D. | E2 – E1/λ |
| Answer» D. E2 – E1/λ | |