| 1 |
X-rays were discovered by |
- A. Curie
- B. Henry Becquerel
- C. Rontgen
- D. None of these
|
| 2 |
Laser is a beam of light which is |
- A. Monochromatic
- B. Coherent
- C. Unidirectional
- D. All of these
|
| 3 |
Bremsstrahlung radiation are examples of |
- A. Atomic spectra
- B. Molecular spectra
- C. Continuous spectra
- D. Discrete spectra
|
| 4 |
Study of hydrogen visible spectrum in |
- A. 1886
- B. 1887
- C. 1895
- D. 1885
|
| 5 |
Life time of metastable states is |
- A. 10<sup>-6</sup> sec or more
- B. 10<sup>-3</sup> sec or more
- C. 10<sup>-5</sup> sec or more
- D. None of these
|
| 6 |
Which series lies in the ultraviolet region. |
- A. Balmer series
- B. Bracket series
- C. Ptund series
- D. Lyman series
|
| 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 |
In Helium Neon laser, the discharge tube is filled with |
- A. 80% He, 20% Neon
- B. 85% He, 15% Neon
- C. 83% He, 17% Neon
- D. 90% He, 10% Neon
|
| 9 |
Which of the following is one of the spectral series of atomic hydrogen? |
- A. Brockett series
- B. Balmer series
- C. P fund series
- D. All of above
|
| 10 |
If 13.6 eV energy is required to ionize the hydrogen atom, then the required energy to remove an electron from n=2 is: |
- A. 10.2 eV
- B. 0 eV
- C. 3.4 eV
- D. 6.8 eV
|
