- A$\text{E} = \frac{\text{m}}{\text{c}^2}$
- BM = Ec2
- CAll of the expressions are accurate.
- Dc = Em2
Explanation:
Before Sir Einstien, mass and energy were two completely different physical quantities, which were not related to each other anyway.
Sir Einstein told that energy and mass are related to each other i.e. energy and mass can be converted into each other by the following relation:
E=mc2, called Sir Einstein's mass-energy equivalence.
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In the network shown in the figure, each of the resistance is equal to 2Ω. The resistance between the points A and B is
|
(a) 1 Ω |
(b) 4 Ω |
(c) 3 Ω |
(d) 2 Ω |
A group of N cells whose emf varies directly with the internal resistance as per the equation EN = 1.5 rN are connected as shown in the figure below. The current I in the circuit is
|
(a) 0.51 amp |
(b) 5.1 amp |
(c) 0.15 amp |
(d) 1.5 amp |
Heavy water is
|
(a) Water at 4 ℃ |
|
(b) Compound of deuterium and oxygen |
|
(c) Compound of heavy oxygen and heavy hydrogen |
| (d) Water, in which soap does not lather |
Assertion : If the temperature of a semiconductor is increased then it's resistance decreases.
Reason : The energy gap between conduction band and valence band is very small
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
Long distance short-wave radio broadcasting uses
|
(a) Ground wave |
(b) Ionospheric wave |
(c) Direct wave |
(d) Sky wave |