- A11 Electrons, 11 protons and 13 neutrons.
- B11 Electrons, 13 protons and 11 neutrons.
- C11 Protons and 13 neutrons.
- D11 Protons and 13 electrons.
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Doppler's effect in sound in addition to relative velocity between source and observer, also depends while source and observer or both are moving. Doppler effect in light depend only on the relative velocity of source and observer. The reason of this is
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(a) Einstein mass - energy relation |
(b) Einstein theory of relativity |
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(c) Photoelectric effect |
(d) None of these |
A 3volt battery with negligible internal resistance is connected in a circuit as shown in the figure. The current I, in the circuit will be
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(a) 1/3 A |
(b) 1 A |
(c) 1.5 A |
(d) 2 A |
In a Young's experiment, two coherent sources are placed 0.90 mm apart and the fringes are observed one metre away. If it produces the second dark fringe at a distance of 1 mm from the central fringe, the wavelength of monochromatic light used would be
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(a) 60 |
(b) 10 |
(c) 10 |
(d) 6 |
A bi-convex lens made of glass (refractive index 1.5) is put in a liquid of refractive index 1.7. Its focal length will
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(a) Decrease and change sign |
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(b) Increase and change sign |
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(c) Decrease and remain of the same sign |
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(d) Increase and remain of the same sign |
To an observer on the earth the stars appear to twinkle. This can be ascribed to
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(a) The fact that stars do not emit light continuously |
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(b) Frequent absorption of star light by their own atmosphere |
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(c) Frequent absorption of star light by the earth's atmosphere |
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(d) The refractive index fluctuations in the earth's atmosphere |