| 1 |
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
|
| 2 |
When meta I is heated sufficiently electrons are given off by the metal. This phenomenon is known as. |
- A. Photoelectric effect
- B. Piezo electric effect
- C. Thermionic emission
- D. Secondary emission
|
| 3 |
Target material used in x-rays tube have following properties. |
- A. High atomic number and high melting pouint
- B. High atomic number and low melting pouint
- C. Low atomic number and low melting pouint
- D. High atomic number only
|
| 4 |
An atom can reside in excited state for |
- A. 10<sup>-8</sup> second
- B. One second
- C. 10<sup>-10</sup> second
- D. More than one second
|
| 5 |
The shortest wave length is Bracket series has wave length. |
- A. 16/Rn
- B. Rn/16
- C. 16 Rn
- D. 4 Rn
|
| 6 |
X-rays were discovered by |
- A. Curie
- B. Henry Becquerel
- C. Rontgen
- D. None of these
|
| 7 |
The first theory about the structure of an atom was introduced by |
- A. Neil Bohr
- B. Einstein
- C. Compton
- D. Rutherford
|
| 8 |
_____ has the largest de Broglie wavelength at same speed. |
- A. Proton
- B. Alpha particle
- C. Carbon atom
- D. Electron
|
| 9 |
A° is the unit of: |
- A. Energy
- B. Length
- C. Nuclear energy
- D. Work
|
| 10 |
Helium-Neon laser discharge tube contains neon |
- A. 82%
- B. 15%
- C. 25%
- D. 85%
|
