- 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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Equivalent capacitance between A and B is
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(a) 8 μC |
(b) 6 μF |
(c) 26 μF |
(d) 10/3 μF |
Assertion : The cloud in sky generally appear to be whitish.
Reason : Diffraction due to cloud is efficient in equal measure at all wavelengths.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
Two insulated charged spheres of radii 20 cm and 25 cm respectively and having an equal charge Q are connected by a copper wire, then they are separated
|
(a) Both the spheres will have the same charge Q |
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(b) Charge on the 20 cm sphere will be greater than that on the 25 cm sphere |
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(c) Charge on the 25 cm sphere will be greater than that on the 20 cm sphere |
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(d) Charge on each of the sphere will be 2Q |
For the production of X-rays of wavelength 0.1 Å the minimum potential difference will be
|
(a) 12.4 kV |
(b) 24.8 kV |
(c) 124 kV |
(d) 248 kV |
A ray of light incident normally on an isosceles right angled prism travels as shown in the figure. The least value of the refractive index of the prism must be
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(a) |
(b) |
(c) 1.5 |
(d) 2.0 |
The half life of radioactive Radon is 3.8 days. The time at the end of which 1/20 th of the Radon sample will remain undecayed is (Given ![]()
|
(a) 3.8 days |
(b) 16.5 days |
(c) 33 days |
(d) 76 days |