The maximum intensity in Young's double slit experiment is I0. Distance between the slits is d = 5 l, where l is the wavelength of monochromatic light used in the experiment. What will be the intensity of light in front of one of the slits on a screen at a distance D = 10d
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(a) |
(b) |
(c) |
(d) |
(a) 
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A copper wire of length 1 m and radius 1 mm is joined in series with an iron wire of length 2 m and radius 3 mm and a current is passed through the wires. The ratio of the current density in the copper and iron wires is
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(a) 18 : 1 |
(b) 9 : 1 |
(c) 6 : 1 |
(d) 2 : 3 |
The first member of the Paschen series in hydrogen spectrum is of wavelength 18,800 Å. The short wavelengths limit of Paschen series is
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(a) 1215 Å |
(b) 6560 Å |
(c) 8225 Å |
(d) 12850 Å |
The average life T and the decay constant λ of a radioactive nucleus are related as
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(a) T λ = 1 |
(b) T = |
(c) |
(d) T = |
If 
undergoes successively 8 a-decays and 6 b-decays, then resulting nucleus is
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(a) |
(b) |
(c) |
(d) |
Cathode rays are similar to visible light rays in that
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(a) They both can be deflected by electric and magnetic fields |
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(b) They both have a definite magnitude of wavelength |
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(b) They both have a definite magnitude of wavelength |
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(d) They both can expose a photographic plate |
Assertion : A metallic shield in form of a hollow shell may be built to block an electric field.
Reason : In a hollow spherical shield, the electric field inside it is zero at every point.
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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. |
