The interference phenomenon takes place
I. In all waves
II. In transverse waves only
III. In longitudinal waves only
IV. In standing waves only
I. In all waves
II. In transverse waves only
III. In longitudinal waves only
IV. In standing waves only
I. In all waves
The wave-front due to source situated at the infinity is
(A) Spherical
(B) Cylindrical
(C) Plane
(D) Rectangular
Wavefront generated from a line source is
a. Cylindrical wavefront
b. Spherical wavefront
c. Plane front
d. Either a.) or b.)
The idea of secondary wavelets for the propagation of a wave was first given by
(a) Newton
(b) Huygens
(c) Maxwell
(d) Fresnel
Which of the following is conserved when light waves interfere?
(a) phase
(b) intensity
(c) amplitude
(d) none of these
Bending of Light phenomena is shown by
(a) Polarization
(b) Diffraction
(c) Interference
(d) Dispersion
A wavefront of a wave has direction with wave motion
(A) Parallel
(B) Perpendicular
(C) opposite
(D) at any angle θ
Which of the following is conserved when light waves interefere?
a. Energy
b.Phase
c. Intensity
d. Amplitude
A 40 mF capacitor is connected to a 200 V, 50 Hz ac supply. The r.m.s value of the current in the circuit is, nearly
(a) 1.7 A
(b) 2.05 A
(c) 2.5 A
(d) 25.1 A
An alternating e.m.f. of angular frequency ω is applied across an inductance. The instantaneous power developed across it has an angular frequency
(a) ω/4
(b) ω/2
(c) ω
(d) 2 ω
The amount of work required to increase the distance between -6µC and 4µC from 6 cm to 18 cm will be :
(a) 1.8 J
(b) 2.4 J
(c) 1.8 µJ
(d) 2.4 µJ
In a double slit interference pattern, the first maxima for infrared light would be
(a) at the same place as the first maxima for green light
(b) closer to the centre than the first maxima for green light
(c) farther from the centre than the first maxima for green light
(d) infrared light does not produce an interference pattern
The ratio of magnetic length to geometric length of a magnet is
a) 0.084
b) 8.4
c) 80.4
d) 0.84
Huygens wave theory allows us to know
A) The wavelength of the wave
(B) The velocity of the wave
(C) The amplitude of the wave
(D) The propagation of wave-fronts
Wave theory of light cannot explain the phenomena of
1. Polarisation 2. Diffraction 3. Interference 4. Crompton effect 5. Photoelectric effect
(A) 3, 4
(C) 1 ,2
(B) 1, 4, 5
(D) 4 ,5