Question

Assertion : X-ray astronomy is possible only from satellites orbiting the earth.
Reason : Efficiency of X-rays telescope is large as compared to any other telescope.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (C)

The earth’s atmosphere is transparent to visible light and radio waves, but absorbs $X-$rays. Therefore $X-$ rays telescope cannot be used on earth surface.