The light sources used in Young’s double slit experiment are:
(A) Incoherent
(B) Coherent
(C) White light
(D) Blue-green-red Light.
(A) Incoherent
(B) Coherent
(C) White light
(D) Blue-green-red Light.
(B) Coherent
The wave-front due to source situated at the infinity is
(A) Spherical
(B) Cylindrical
(C) Plane
(D) Rectangular
The colours on the soap bubble is due to
(a) Interference
(b) Diffraction
(c) Polarisation
(d) Reflection
Which of the following is conserved when light waves interfere?
(a) phase
(b) intensity
(c) amplitude
(d) none of these
The parameter of light wave which remain same after refraction
(A) speed
(B) frequency
(C) wavelength
(D) none of these
The wavefront due to a source situated at infinity is
(a) spherical
(b) cylindrical
(c) planar
(d) circular
Which of the following is conserved when light waves interference?
(a) phase.
(b) intensity.
(c) amplitude.
(d) none of these.
The locus of all the points vibrating in same phase of oscillation is called
(A) Wavelet
(B) Wavefront
(C) Wavetrain
(D) Rays
Two conducting spheres of radii \(r^1\) and \(r^2\) are equally charged. The ratio of their potential is
(a) (\(r^1\)/\(r^2\))²
(b) (\(r^1\)\(r^2\))²
(c) (\(r^1\)/\(r^2\))
(d) (\(r^2\)/\(r^1\))
When light suffers reflection at the interface between water and glass, the change of phase in the reflected wave is
(a) zero..
(b) π.
(c) π/2.
(d) 2π.
A phase difference of 5π corresponds to a path difference (in terms of λ) of:
(a) 5λ
(b) 10λ.
(c) 5λ/2
(d) 2λ
In the phenomena of Diffraction of light when the violet light is used in the experiment is used instead of red light then.
(a) Fringe width increases.
(b) No change in fridge width.
(c) Fringe width decreases.
(d) Colour pattern is formed.
The V-i graph for a conductor at temperature T¹ and T² are as shown in the figure. (T² - T¹) is proportional to
(a) cos θ
(b) sin θ
(c) cot 2θ
(d) tan θ
A wavefront of a wave has direction with wave motion
(A) Parallel
(B) Perpendicular
(C) opposite
(D) at any angle θ
The charges on two spheres are +7mC and –5mC respectively. They experience a force F. If each of them is given an additional charge of –2mC, the new force of attraction will be