Radio waves and visible light in vacuum have
|
(a) Same velocity but different wavelength |
|
(b) Continuous emission spectrum |
|
(c) Band absorption spectrum |
|
(d) Line emission spectrum |
(a) Same velocity but different wavelength
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An X-ray has a wavelength of 0.010 Å. Its momentum is
| (a) 2.126 × 10–23 kg-m/sec | (b) 6.626 × 10-22 kg-m/sec |
| (c) 3.456 × 20–25 kg-m/sec | (d) 3.313 × 10–22 kg-m/sec |
A metallic ring connected to a rod oscillates freely like a pendulum. If now a magnetic field is applied in horizontal direction so that the pendulum now swings through the field, the pendulum will
|
(a) Keep oscillating with the old time period |
|
(b) Keep oscillating with a smaller time period |
|
(c) Keep oscillating with a larger time period |
|
(d) Come to rest very soon |
An electron and a proton with equal momentum enter perpendicularly into a uniform magnetic field, then
|
(a) The path of proton shall be more curved than that of electron |
|
(b) The path of proton shall be less curved than that of electron |
|
(c) Both are equally curved |
|
(d) Path of both will be straight line |
Minimum excitation potential of Bohr's first orbit in hydrogen atom is
|
(a) 13.6 V |
(b) 3.4 V |
(c) 10.2 V |
(d) 3.6 V |
The time period of a vibration magnetometer is T0. Its magnet is replaced by another magnet whose moment of inertia is 3 times and magnetic moment is 1/3 of the initial magnet. The time period now will be
|
(a) 3T0 |
(b) T0 |
(c) |
(d) T0/3 |
