Explanation:
In a nuclear reactor, a large fissile atomic nucleus like uranium-235 absorbs a thermal neutron and undergoes a nuclear fission reaction. The heavy nucleus splits into two or more lighter nuclei releasing gamma radiation and free neutrons.
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3.8 days is the half-life period of a sample. After how many days, the sample will become 1/8th of the original substance
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(a) 11.4 |
(b) 3.8 |
(c) 3 |
(d) None of these |
Three observers A, B and C measure the speed of light coming from a source to be 
and 
. The observer A moves towards the source, the observer C moves away from the source with the same speed. The observer B stays stationary. the surrounding space is vacuum every where. Then
(a) 
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(b) 
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(c) 
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(d) 
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Assertion : The electromagnetic waves of shorter wavelength can travel longer distances on earth's surface than those of longer wavelengths.
Reason : Shorter the wavelength, the larger is the velocity of wave propagation.
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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. |
The total power content of an AM wave is 900 W. For 100% modulation, the power transmitted by each side band is
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(a) 50 W |
(b) 100 W |
(c) 150 W |
(d) 200 W |
1000 small water drops each of radius r and charge q coalesce together to form one spherical drop. The potential of the big drop is larger than that of the smaller drop by a factor of
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(a) 1000 |
(b) 100 |
(c) 10 |
(d) 1 |
The energy gap of silicon is 1.14 eV. The maximum wavelength at which silicon will begin absorbing energy is
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(a) 10888 Å |
(b) 1088.8 Å |
(c) 108.88 Å |
(d) 10.888 Å |