Explanation:
For electromagnetic waves E and B are always perpendicular to each other and perpendicular to the direction of propagation. The direction of propagation is the direction of E × B.
The direction of propagation of the wave is the direction of propagation of its energy and power.
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The angle of polarisation for any medium is 60o, what will be critical angle for this
(a)  
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(b) 
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(c) |
(d) |
The image of an extended object, placed perpendicular to the principal axis of a mirror, will be erect if:
$\frac{\lambda}{4}$
$\frac{\lambda}{3}$
$\frac{\lambda}{2}$
$\lambda.$
In a nuclear fission reaction
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(a) Two light nuclei combine to produce a heavier nucleus |
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(b) A light nucleus bombarded by thermal neutrons breaks up |
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(c) A heavy nucleus bombarded by thermal neutrons breaks up |
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(d) A heavy nucleus breaks up by itself |
Assertion : Fragments produced in the fission of 
are radioactive.
Reason : The fragments have abnormally high proton to neutron ratio.
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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. |
