- AInterference
- BReflection
- CPhotoelectric effect
- DRefraction
Explanation:
Interference
Christian Huygens verified the wave nature of light using interference.
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An N-type and P-type silicon can be obtained by doping pure silicon with
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(a) Arsenic and Phosphorous |
(b) Indium and Aluminium |
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(c) Phosphorous and Indium |
(d) Aluminium and Boron |
When a magnetic field is applied in a direction perpendicular to the direction of cathode rays, then their
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(a) Energy decreases |
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(b) Energy increases |
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(c) Momentum increases |
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(d) Momentum and energy remain unchanged |
A rod of length 20 cm is rotating with angular speed of 100 rps in a magnetic field of strength 0.5 T about it’s one end. What is the potential difference between two ends of the rod
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(a) 2.28 V |
(b) 4.28 V |
(c) 6.28 V |
(d) 2.5 V |
In Young’s double slit experiment the wavelength of light was changed from 7000 Å to 3500 Å. While doubling the separation between the slits which of the following is not true for this experiment
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(a) The width of the fringes changes |
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(b) The colour of bright fringes changes |
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(c) The separation between successive bright fringes changes |
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(d) The separation between successive dark fringes remains unchanged |
1 Curie is equal to
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(a) 3 |
(b) 3.7 |
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(c) 5 |
(d) 3.7 |
Assertion : For best contrast between maxima and minima in the interference pattern of Young’s double slit experiment, the intensity of light emerging out of the two slits should be equal.
Reason : The intensity of interference pattern is proportional to square of amplitude.
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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. |