- Athe presence of neutrons in the nucleus.
- Bthe finite size of nucleus.
- Cthe orbital angular momentum of electrons.
- Dthe spin angular momentum of electrons.
Explanation:
The fine structure describes the splitting of the spectral lines of atoms due to electron spin angular momentum.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Which of the following is true
|
(a) Lyman series is a continuous spectrum |
|
(b) Paschen series is a line spectrum in the infrared |
|
(c) Balmer series is a line spectrum in the ultraviolet |
|
(d) The spectral series formula can be derived from the Rutherford model of the hydrogen atom |
The mechanism of the hydrogen bomb is based on
|
(a) Fission of isotopes of hydrogen |
(b) Fusion of protons |
|
(c) Fusion of deutrium and tritium |
(d) Fusion of neutrons |
A semiconductor device is connected in a series circuit with a battery and a resistance. A current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops almost to zero. The device may be
| (a) A P-type semiconductor | (b) An N-type semiconductor |
| (c) A PN-junction | (d) An intrinsic semiconductor |
$\text{v}=\frac{\text{v}_1+\text{v}_2}{2}$
$\text{v}=\sqrt{\text{v}_1\text{v}_2}$
$\frac{2}{\text{v}}=\frac{1}{\text{v}_1}+\frac{1}{\text{v}_2}$
$\frac{1}{\text{v}}=\frac{1}{\text{v}_1}+\frac{1}{\text{v}_2}$
The following four wires are made of the same material and are at the same temperature. Which one of them has highest electrical resistance
|
(a) Length = 50 cm, diameter = 0.5 mm |
(b) Length = 100 cm, diameter = 1 mm |
|
(c) Length = 200 cm, diameter = 2 mm |
(d) Length = 300 cm, diameter = 3 mm |
A metal plate gets heated, when cathode rays strike against, it due to
|
(a) Kinetic energy of cathode rays |
(b) Potential energy of cathode rays |
|
(c) Linear velocity of cathode rays |
(d) Angular velocity of cathode rays |

Two charges are at a distance ‘d’ apart. If a copper plate (conducting medium) of thickness is placed between them, the effective force will be
|
(a) 2F |
(b) F / 2 |
(c) 0 |
(d) |