Q128 / 180 · AIIMS 2008 · Physics

Assertion : X-rays can penetrate through the flesh but not through the bones. Reason : The penetrating power of X-rays depends on voltage.

  • A
    If both assertion and reason are true and reason is the correct explanation of assertion
  • Correct answer
    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.

Solution

Hardness penetrating power of X-ray depends upon accelerating voltage applied across $\mathrm{X}$-ray tube. Characteristic $\mathrm{X}$-ray relate to the material of target. X-ray can't pass through matter of heavier element like bones (which contain phosphorus and calcium) but can pass through matter of lighter element as flesh (which contain oxygen, hydrogen and carbon).

Hence, the correct answer is option: 'B'.

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