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A: In the middle to high latitudes on a ...

A: In the middle to high latitudes on a dark night an aurora or the curtain of light hangs down from the sky. This curtain is local, several hundred kilometer high, several thousand kilometer long but less than 1 km thick.
R: Electrons and protons trapped in the helical terrestiral magnetic field collide with atoms and molecules of air, causing that air to emit light.

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertion then mark (1)

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark 2.

C

If assertion is true statement but Reason is false, then mark (3)

D

If both Assertion and Reason are false statements, then mark (4)

Text Solution

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The correct Answer is:
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