MCQOPTIONS
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MCQOPTIONS
This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Give the unit of work function. |
| A. | Electron volt |
| B. | Joule |
| C. | Hertz |
| D. | Watt |
| Answer» B. Joule | |
| 2. |
Two metals A and B have work functions 4 eV and 10 eV respectively. Which metal has a higher threshold wavelength? |
| A. | Metal A |
| B. | Metal B |
| C. | Both |
| D. | Neither |
| Answer» B. Metal B | |
| 3. |
Photoelectric emission is possible at all frequencies. |
| A. | True |
| B. | False |
| Answer» C. | |
| 4. |
Which radiations will be most effective for the emission of electrons from a metallic surface? |
| A. | Microwaves |
| B. | X rays |
| C. | Ultraviolet |
| D. | Infrared |
| Answer» D. Infrared | |
| 5. |
Why are alkali metals most suited as photo-sensitive metals? |
| A. | High frequency |
| B. | Zero rest mass |
| C. | High work function |
| D. | Low work function |
| Answer» E. | |
| 6. |
What happens to the wavelength of a photon after it collides with an electron? |
| A. | Increases |
| B. | Decreases |
| C. | Remains the same |
| D. | Infinite |
| Answer» B. Decreases | |
| 7. |
If the wavelength of electromagnetic radiation is doubled, what will happen to the energy of photons? |
| A. | Remains the same |
| B. | Doubled |
| C. | Halved |
| D. | Infinite |
| Answer» D. Infinite | |
| 8. |
Which photon is more energetic: A red one or a violet one? |
| A. | Both |
| B. | Red |
| C. | Violet |
| D. | Neither |
| Answer» D. Neither | |