Two coherent sources of light can be obtained by
|
(a) Two different lamps |
|
(b) Two different lamps but of the same power |
|
(c) Two different lamps of same power and having the same colour |
|
(d) None of the above |
(d) None of the above
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In Fresnel’s biprism (μ = 1.5) experiment the distance between source and biprism is 0.3 m and that between biprism and screen is 0.7m and angle of prism is 1°. The fringe width with light of wavelength 6000 Å will be
|
(a) 3 cm |
(b) 0.011 cm |
(c) 2 cm |
(d) 4 cm |
Light of wavelength 
strikes a photo-sensitive surface and electrons are ejected with kinetic energy E. If the kinetic energy is to be increased to 2E, the wavelength must be changed to 
where
|
(a) |
(b) |
(c) |
(d) |
The (𝜏 – 𝜃) graph for a coil is
|
(a)
|
(b)
|
(c)
|
(d)
|
A metal rod of length 2 m is rotating with an angular velocity of 100 rad/sec in a plane perpendicular to a uniform magnetic field of 0.3 T. The potential difference between the ends of the rod is
|
(a) 30 V |
(b) 40 V |
(c) 60 V |
(d) 600 V |
An N-type and P-type silicon can be obtained by doping pure silicon with
|
(a) Arsenic and Phosphorous |
(b) Indium and Aluminium |
|
(c) Phosphorous and Indium |
(d) Aluminium and Boron |
In the following Wheatstone bridge P/Q = R/S. If key K is closed, then the galvanometer will show deflection
|
(a) In left side |
(b) In right side |
(c) No deflection |
(d) In either side |
