| 1 |
Number of electros emitted in photo electric effect depend upon. |
- A. Intensity of incident light
- B. Frequency of incident light
- C. Energy of incident light
- D. Wavelength of incident of light
|
| 2 |
Compton's effect is associated with |
- A. gamma rays
- B. Beta rays
- C. X rays
- D. Positive rays
|
| 3 |
Internal frame is a frame is which |
- A. 1st law holds
- B. 2nd law holds
- C. 3rd law holds
- D. Kelvin's law holds
|
| 4 |
Pair production can take place only when energy of radiation is equal and greater than 1.02 MeV, thus correct option is. |
- A. X rays
- B. Gama rays
- C. Heat Radiation
- D. Ultraviolet rays
|
| 5 |
Potassium Cathodes in photocell emit electrons for a light. |
- A. Visible
- B. Infra red
- C. Ultra violet
- D. X rays
|
| 6 |
The most refined form of matter is: |
- A. Smoke
- B. Light
- C. Ice
- D. Fog
|
| 7 |
Maximum Compton shift is observed at. |
- A. 30<sup>o</sup>C
- B. 90<sup>o</sup>C
- C. 45<sup>o</sup>C
- D. 180<sup>o</sup>C
|
| 8 |
Minimum energy needed to escape an electron ofrm metal surface is called: |
- A. Threshold energy
- B. Threshold frequency
- C. Work function
- D. Work ability
|
| 9 |
The unit of work function is |
- A. Electron volt
- B. Ampere
- C. Volt cell
- D. Hz
|
| 10 |
If the kinetic energy of a free electron doubles, its de Broglie wavelength changes by the factor. |
- A. <b style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 16px;">√</b><span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 16px;">2</span>
- B. 1/<b style="font-family: arial, sans-serif; font-size: 16px; color: rgb(34, 34, 34);">√</b><span style="font-family: arial, sans-serif; font-size: 16px; color: rgb(34, 34, 34);">2</span>
- C. 2
- D. 1/2
|