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AIIMS 2004
Exam
AIIMS
Year
2004
Subject
Physics
Chapter
Electromagnetic Waves

AIIMS 2004 · Physics · Electromagnetic Waves

Assertion : Crystalline solids can cause X-rays to diffract. Reason...

Assertion : Crystalline solids can cause X-rays to diffract. Reason : Interatomic distance in crystalline solids is of the order of 0.1 nm0.1 \mathrm{~nm}.

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

For diffraction, the slit width should be of the order of the incident wavelength. The regular spacing of the atoms in crystal is of the order of wavelength of X-rays (0.1 nm)(0.1 \mathrm{~nm}) because of which Xrays are diffracted from the crystals.
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