| 1 |
For Paschen series, the value of 'n' starts from |
|
| 2 |
Laser is a device which can produce: |
- A. Intense beam of light
- B. Coherant beam of light
- C. Monochromatic beam of light
- D. All of the above
|
| 3 |
Charge on positron is: |
- A. Negative
- B. Positive
- C. Netural
- D. None of these
|
| 4 |
If electron jumps from second orbit to first orbit in hydrogen atom it emits photon of. |
- A. 3.40 eV
- B. 10.20 eV
- C. 13.6 eV
- D. 3.8 eV
|
| 5 |
Hydrogen atom spectrum does not lie in |
- A. Ultraviolet region
- B. Visible region
- C. Infrared region
- D. X ray region
|
| 6 |
The first theory about the structure of an atom was introduced by |
- A. Neil Bohr
- B. Einstein
- C. Compton
- D. Rutherford
|
| 7 |
Balmer Empirical formula explains the electromagnetic radiation of any excited atom in terms of their. |
- A. Energy
- B. Mass
- C. Wave length
- D. Momentum
|
| 8 |
Helium-Neon laser discharge tube contains neon |
- A. 82%
- B. 15%
- C. 25%
- D. 85%
|
| 9 |
The typical nuclei are less than: |
- A. 10<sup>-16</sup>m
- B. 10<sup>-14</sup>m
- C. 10<sup>-12</sup>m
- D. 10<sup>-10</sup>m
|
| 10 |
Reflecting mirrors in laser is used to |
- A. Further stimulation
- B. For producing more energetic lasers
- C. Both (a) and (b)
- D. None of these
|
