Explanation:
For interference to take place the light sources need to be either in phase or have a constant phase difference. In case the phase difference keeps changing the interference pattern will keep on changing, as a result of interference pattern will be observed.
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Two spheres A and B of radius 4cm and 6cm are given charges of 80 μC and 40 μC respectively. If they are connected by a fine wire, the amount of charge flowing from one to the other is
|
(a) 20 μC from A to B |
(b) 16 μC from A to B |
|
(c) 32 μC from B to A |
(d) 32 μC from A to B |
1 mg gold undergoes decay with 2.7 days half-life period, amount left after 8.1 days is
|
(a) 0.91 mg |
(b) 0.25 mg |
(c) 0.5 mg |
(d) 0.125 mg |
A pure semiconductor behaves slightly as a conductor at
|
(a) Room temperature |
(b) Low temperature |
|
(c) High temperature |
(d) Both (b) and (c) |
A photodetector is made from a semiconductor In 0.53Ga 0.47As with Eg = 0.73 eV. What is the maximum wavelength, which it can detect
|
(a) 1000 nm |
(b) 1703 nm |
(c) 500 nm |
(d) 173 nm |
Liquid oxygen remains suspended between two pole faces of a magnet because it is
|
(a) Diamagnetic |
(b) Paramagnetic |
(c) Ferromagnetic |
(d) Antiferromagnetic |
In a common emitter transistor, the current gain is 80. What is the change in collector current, when the change in base current is 250 mA
|
(a) 80 × 250 mA |
(b) (250 – 80) mA |
(c) (250 + 80) mA |
(d) 250/80 mA |