In a single slit diffraction experiment first minimum for red light (660 nm) coincides with first maximum of some other wavelength l'. The value of l' is
|
(a) 4400 Å |
(b) 6600 Å |
(c) 2000 Å |
(d) 3500 Å |
(a) 4400 Å
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The total power content of an AM wave is 900 W. For 100% modulation, the power transmitted by each side band is
|
(a) 50 W |
(b) 100 W |
(c) 150 W |
(d) 200 W |
In the Young’s double slit experiment, for which colour the fringe width is least
|
(a) Red |
(b) Green |
(c) Blue |
(d) Yellow |
A heavenly body is receding from earth such that the fractional change in l is 1, then its velocity is
|
(a) C |
(b) |
(c) |
(d) |
In a junction diode, the holes are due to
| (a) Protons | (b) Neutrons | (c) Extra electrons | (d) Missing of electrons |
If E is the electric field intensity of an electrostatic field, then the electrostatic energy density is proportional to
|
(a) E |
(b) |
(c) |
(d) |
Let V and H be the vertical and horizontal components of earth's magnetic field at any point on earth. Near the north pole
|
(a) V >> H |
(b) V << H |
(c) V = H |
(d) V = H = 0 |
The variation of induced emf (E) with time (t) in a coil if a short bar magnet is moved along its axis with a constant velocity is best represented as
(a)
|
(b)
|
(c)
|
(d)
|
