If an interference pattern have maximum and minimum intensities in 36 : 1 ratio then what will be the ratio of amplitudes
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(a) 5 : 7 |
(b) 7 : 4 |
(c) 4 : 7 |
(d) 7 : 5 |
(d) 7 : 5
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Two coherent light sources S1 and S2 (l= 6000 Å) are 1mm apart from each other. The screen is placed at a distance of 25 cm from the sources. The width of the fringes on the screen should be
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(a) 0.015 cm |
(b) 0.025 cm |
(c) 0.010 cm |
(d) 0.030 cm |
Smaller pieces of heavy stones and metals which on entering earth's atmosphere burns out are
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(a) Comets |
(b) Meteorites |
(c) Asteroids |
(d) All of these |
Cathode rays are produced when the pressure is of the order of
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(a) 2 cm of Hg |
(b) 0.1 cm of Hg |
(c) 0.01 mm of Hg |
(d) 1 μm of Hg |
The frequency of the incident light falling on a photosensitive metal plate is doubled, the kinetic energy of the emitted photoelectrons is
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(a) Double the earlier value |
(b) Unchanged |
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(c) More than doubled |
(d) Less than doubled |
Assertion : In a simple battery circuit the point of lowest potential is positive terminal of the battery
Reason : The current flows towards the point of the higher potential as it flows in such a circuit from the negative to the positive terminal.
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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. |