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AIIMS 2010
Exam
AIIMS
Year
2010
Subject
Physics
Chapter
Electromagnetic Waves

AIIMS 2010 · Physics · Electromagnetic Waves

Assertion : X-ray astronomy is possible only from satellites...

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.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion
  3. CIf assertion is true but reason is false
  4. DIf both assertion and reason are false.

Correct answer

C. If assertion is true but reason is false

Step-by-step solution

The earth's atmosphere is transparent to visible light and radio waves, but absorbs X-rays. Therefore X\mathrm{X}-rays telescope cannot be used on earth surface.
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