A magnet is made to oscillate with a particular frequency, passing through a coil as shown in figure. The time variation of the magnitude of e.m.f. generated across the coil during one cycle is
(a)
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(b)
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(c)
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(d)
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Ratio of the wavelengths of first line of Lyman series and first line of Balmer series is
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(a) 1: 3 |
(b) 27 : 5 |
(c) 5 : 27 |
(d) 4 : 9 |
From the following, what charges can be present on oil drops in Millikan's experiment (Here e is the electronic charge)
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(a) Zero, equal to the magnitude of charge on α - particle |
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(b) 2e, 1.6 |
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(c) 1.6 |
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(d) 1.5 e, e |
At what distance from a convex lens of focal length 30 cm, an object should be placed so that the size of the image be 1/2 of the object
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(a) 30 cm |
(b) 60 cm |
(c) 15 cm |
(d) 90 cm |
