To demonstrate the phenomenon of interference, we require two sources which emit radiation
|
(a) Of the same frequency and having a define phase relationship |
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(b) Of nearly the same frequency |
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(c) Of the same frequency |
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(d) Of different wavelengths |
(a) Of the same frequency and having a define phase relationship
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Switch S of the circuit shown in figure. is closed at t = 0. If e denotes the induced
emf in L and i, the current flowing through the circuit at time t, which of the following graphs is correct
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(a)
|
(b)
|
(c)
|
(d)
|
The energy liberated on complete fission of 1 kg of 
is (Assume 200 MeV energy is liberated on fission of 1 nucleus)
|
(a) 8.2 |
(b) 8.2 |
(c) 8.2 |
(d) 8.2 |
The sensitiveness of a moving coil galvanometer can be increased by decreasing
|
(a) The number of turns in the coil |
|
(b) The area of the coil |
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(c) The magnetic field |
|
(d) The couple per unit twist of the suspension |
A thin plano-convex lens acts like a concave mirror of focal length 0.2 m when silvered from its plane surface. The refractive index of the material of the lens is 1.5. The radius of curvature of the convex surface of the lens will be
|
(a) 0.4 m |
(b) 0.2 m |
(c) 0.1 m |
(d) 0.75 m |
An electron is projected along the axis of a circular conductor carrying some current. Electron will experience force
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(a) Along the axis |
(b) Perpendicular to the axis |
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(c) At an angle of 4o with axis |
(d) No force experienced |
