Doppler's effect in sound in addition to relative velocity between source and observer, also depends while source and observer or both are moving. Doppler effect in light depend only on the relative velocity of source and observer. The reason of this is
|
(a) Einstein mass - energy relation |
(b) Einstein theory of relativity |
|
(c) Photoelectric effect |
(d) None of these |
(b) Einstein theory of relativity
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Three α - particles and one β - particle decaying takes place in series from an isotope 
. Finally the isotope obtained will be
|
(a) |
(b) |
(c) |
(d) |
A cell of internal resistance r is connected to an external resistance R. The current will be maximum in R, if
|
(a) R = r |
(b) R < r |
(c) R > r |
(d) R = r/2 |
In Young's double slit experiment, the phase difference between the light waves reaching third bright fringe from the central fringe will be (λ =6000 Å )
|
(a) Zero |
(b) 2π |
(c) 4 π |
(d) 6 π |
The expression for magnetic induction inside a solenoid of length L carrying a current I and having N number of turns is
|
(a) |
(b) |
(c) |
(d) |
The magnetic field at a distance r from a long wire carrying current i is 0.4 Tesla. The magnetic field at a distance 2r is
|
(a) 0.2 Tesla |
(b) 0.8 Tesla |
(c) 0.1 Tesla |
(d) 1.6 Tesla |
