For the sustained interference of light, the necessary condition is that the two sources should
|
(a) Have constant phase difference |
(b) Be narrow |
|
(c) Be close to each other |
(d) Of same amplitude |
(a) Have constant phase difference
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Average energy stored in a pure inductance L when a current i flows through it, is
|
(a) |
(b) |
(c) |
(d) |
For the Bohr's first orbit of circumference 2πr, the de-Broglie wavelength of revolving electron will be
|
(a) 2πr |
(b) πr |
(c) |
(d) |
Our eye is most sensitive for which of the following wavelength
|
(a) 4500 Å |
|
(b) 5500 Å |
|
(c) 6500 Å |
|
(d) Equally sensitive for all wave lengths of visible spectrum |
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 |
