- APhotoelectrons absorb and emit photons
- BThe velocity of light is the same for all observers
- CMass and energy are intra- convertible
- DEnergy and momentum are conserved
Explanation:
The main postulate of Einstein's special theory of relativity is that the speed of light is constant and equal to c in all the inertial frames i.e the velocity of light is same for all observers.
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A bulb of 100 watt is hanging at a height of one meter above the centre of a circular table of diameter 4 m. If the intensity at a point on its rim is , then the intensity at the centre of the table will be
|
(a) |
(b) 2 |
(c) 2 |
(d) 5 |
The total current supplied to the circuit by the battery is
|
(a) 1 A |
(b) 2 A |
(c) 4 A |
(d) 6 A |
A virtual image three times the size of the object is obtained with a concave mirror of radius of curvature 36 cm. The distance of the object from the mirror is
|
(a) 5 cm |
(b) 12 cm |
(c) 10 cm |
(d) 20 cm |