MCQOPTIONS
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MCQOPTIONS
This section includes 6 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. |
For the photoelectric effect in sodium, the figure shows the plot of cut-off voltage versus frequency of incident radiation. The threshold frequency is __________ |
| A. | 6.5 X 1014 Hz |
| B. | 4.5 X 1014 Hz |
| C. | 3 X 1014 Hz |
| D. | 5 X 1014 Hz |
| Answer» D. 5 X 1014 Hz | |
| 2. |
The Kinetic energy of a photoelectron emitted on shining a light of wavelength 6.2 X 10-6 m on a metal surface of work function 0.1 eV is _________________ |
| A. | 0.01 eV |
| B. | 0.02 eV |
| C. | 0.1 eV |
| D. | 1 eV |
| Answer» D. 1 eV | |
| 3. |
Light of wavelength 3500 Å is incident on two metals A and B. Which metal will yield more photoelectrons if their work functions are 5 eV and 2 eV respectively? |
| A. | A |
| B. | B |
| C. | A & B |
| D. | C |
| Answer» C. A & B | |
| 4. |
Identify the correct order of frequencies. |
| A. | v1 > v2 > v3 |
| B. | v2 > v3 > v1 |
| C. | v3 > v2 > v1 |
| D. | v1 > v3 > v2 |
| Answer» D. v1 > v3 > v2 | |
| 5. |
What is the relation between the interaction parameter, ‘b’, and atomic radius, R, for the Photoelectric effect? |
| A. | b > R |
| B. | b ≈ R |
| C. | b < R |
| D. | no relation between b and R |
| Answer» B. b ≈ R | |
| 6. |
During Einstein’s Photoelectric Experiment, what changes are observed when the frequency of the incident radiation is increased? |
| A. | The value of saturation current increases |
| B. | No effect |
| C. | The value of stopping potential increases |
| D. | The value of stopping potential decreases |
| Answer» D. The value of stopping potential decreases | |