Explanation:
Huygens's Principle states that every point on a wavefront is a source of secondary wavelets, which spread forward at the same speed.
Thus is enables to find the position of wavefront.
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Which of the following is most unstable
|
(a) Electrons |
(b) Protons |
(c) Neutrons |
(d) α -particle |
What is the path difference of destructive interference
|
(a) nl |
(b) n(λ + 1) |
(c) |
(d) |
A radioactive decay chain starts from 
and produces by successive emissions. The emitted particles can be
| (a) Two a-particles and one b-particle |
(b) Three  particles
|
|
(c) One a particle and two particles
|
(d) One a particle and two  particles
|
A long copper tube of inner radius R carries a current i. The magnetic field B inside the tube is
|
(a) |
(b) |
(c) |
(d) Zero |
In a transistor circuit shown here the base current is 35 mA. The value of the resistor Rb is
| (a) 123.5 kW | (b) 257 kW | (c) 380.05 kW | (d) None of these |
A steady current flows in a metallic conductor of non-uniform cross-section. The quantity/ quantities constant along the length of the conductor is/are
|
(a) Current, electric field and drift speed |
(b) Drift speed only |
|
(c) Current and drift speed |
(d) Current only |
The time of revolution of an electron around a nucleus of charge Ze in nth Bohr orbit is directly proportional to
|
(a) n |
(b) |
(c) |
(d) |
