- ACosmic rays
- BLight raus
- CSound waves
- DAll of these
Explanation:
Interference (constructive and destructive) is one of the basic properties of a wave, therefore it will occur in all the given waves, no matter they are electromagnetic or mechanical, transverse or longitudinal.
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When radiation is incident on a photoelectron emitter, the stopping potential is found to be 9 volts. If e/m for the electron is 1.8
the maximum velocity of the ejected electrons is
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(a) 6 |
(b) 8 |
(c) 1.8 |
(d) 1.8 |
Minimum deviation is observed with a prism having angle of prism A, angle of deviation δ, angle of incidence i and angle of emergence e. We then have generally
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(a) i > e |
(b) i < e |
(c) i = e |
(d) i = e = δ |
In frequency modulation
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(a) The amplitude of modulated wave varies as frequency of carrier wave |
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(b) The frequency of modulated wave varies as amplitude of modulating wave |
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(c) The amplitude of modulated wave varies as amplitude of carrier wave |
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(d) The frequency of modulated wave varies as frequency of modulating wave |
Assertion : Fax is a modulating and demodulating device.
Reason : It is necessary for exact reproduction of a document.
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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 assertion is false but reason is true. |
In the above question, potential difference across the 40Ω resistance will be
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(a) Zero |
(b) 80 V |
(c) 40 V |
(d) 120 V |
A caesium photocell, with a steady potential difference of 60V across, is illuminated by a bright point source of light 50 cm away. When the same light is placed 1m away the photoelectrons emitted from the cell
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(a) Are one quarter as numerous |
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(b) Are half as numerous |
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(c) Each carry one quarter of their previous momentum |
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(d) Each carry one quarter of their previous energy |