A phase difference of 5π corresponds to a path difference (in terms of λ) of:
(a) 5λ
(b) 10λ.
(c) 5λ/2
(d) 2λ
(a) 5λ
(b) 10λ.
(c) 5λ/2
(d) 2λ
(c) 5λ/2
The colours on the soap bubble is due to
(a) Interference
(b) Diffraction
(c) Polarisation
(d) Reflection
The wavefront due to a source situated at infinity is
(a) spherical
(b) cylindrical
(c) planar
(d) circular
In YDSE, The distance between two consecutive bright and dark fringes are given by:
(a) β=λD/d
(b) β=λd/D
(c) β=λDd
(d) β=λ/Dd
The idea of secondary wavelets for the propagation of a wave was first given by
(a) Newton
(b) Huygens
(c) Maxwell
(d) Fresnel
The wave-front due to source situated at the infinity is
(A) Spherical
(B) Cylindrical
(C) Plane
(D) Rectangular
A wavefront of a wave has direction with wave motion
(A) Parallel
(B) Perpendicular
(C) opposite
(D) at any angle θ
Bending of Light phenomena is shown by
(a) Polarization
(b) Diffraction
(c) Interference
(d) Dispersion
Four charges 2C,-3C,-4C and 5C respectively are placed at the four corners of a square .Which of the following statements is true for the point of intersection of the diagonals.
1. E=0,V=0
2. E=0 V≠0
3. E≠0 V=0
4. E≠0 V≠0
A tiny spherical oil drop carrying a net charge q is balanced in still air with a vertical uniform electric field strength 81/7 x 10⁵ Vm⁻¹. When the field is switched off, the drop is observed to fall with terminal velocity 2 x 10⁻³ ms⁻¹, given g = 9.8 ms⁻², viscosity of the air = 1.8 x 10⁻⁵ Nsm⁻², and the density of oil = 900 kgm⁻¹. The magnitude of q is.
(A) 1.6 x 10⁻¹⁹ C
(B) 3.2 x 10⁻¹⁹ C
(C) 4.0 x 10⁻¹⁹ C
(D) 8.0 x 10⁻¹⁹ C
How does the angular separation between fringes in single slit diffraction experiment change when the distance of separation between the slit and screen is doubled?
i. Becomes twice
ii. Remains same
iii. Becomes half
iv. Becomes one-fourth
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
A wire of resistance 0.5 Ωm⁻¹ is bent into a circle of radius 1m. The same wire is connected across a diameter AB as shown in the fig. The equivalent resistance is
(a) Π ohm
(b) Π (Π + 2) ohm
(c) Π/( Π + 4) ohm
(d) (Π + 1) ohm
In the phenomenon of diffraction of light, when blue light is used in the experiment instead of red light, then
i. Fringes will become narrower
ii. Fringes will become broader
iii. No change in fringe width
iv. None of the above
Which among the following isn’t a suitable phenomenon to establish that light is wave motion?
a) Interference.
b) Diffraction.
c) Reflection.
d) Polarization.