Two identical light sources S1 and S2 emit light of same wavelength l. These light rays will exhibit interference if
|
(a) Their phase differences remain constant |
|
(b) Their phases are distributed randomly |
|
(c) Their light intensities remain constant |
|
(d) Their light intensities change randomly |
(a) Their phase differences remain constant
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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 |
In a radioactive substance at t = 0, the number of atoms is 8 
. Its half life period is 3 years. The number of atoms 1 will remain after interva
|
(a) 9 yearss |
(b) 8 years |
(c) 6 years |
(d) 24 years |
The point representing the cut off grid voltage on the mutual characteristic of triode is
| (a) S | (b) R |
(c) O |
(d) P |
1 Curie is equal to
|
(a) 3 |
(b) 3.7 |
|
(c) 5 |
(d) 3.7 |
