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NEET2004PhysicsNuclear PhysicsActual

Assertion : ⁹⁰ Sr from the radioactive fall out from a nuclear bomb ends up in the bones of human beings through the milk consumed by them. It causes impairment of the production of red blood cells. Reason : The energetics -particles emitted in the decay of ⁹⁰ Sr damage the bone marrow.

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

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

Step-by-step solution

Assertion is true. ₃₈⁹⁰ Sr decays to ₃₉⁹⁰ Y by the emission of -rays. Sr gets absorbed in bones along with calcium. Reason is also true. ⁹⁰ Sr ⁹⁰ Y Strontium decays to Yitrium. This emits -rays of very high energy. Sr does not emit -rays. The damage is by the -rays only.

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