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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Coherent sources are those sources for which
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(a) Phase difference remain constant |
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(b) Frequency remains constant |
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(c) Both phase difference and frequency remains constant |
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(d) None of these |
A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, the new value of the magnetic field is
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(a) B |
(b) 2 B |
(c) 4 B |
(d) B/2 |