Assertion: 90Sr from the radioactive fall out from a nuclear bomb ends

1.	Assertion: 90Sr 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 energeticβ-particles emitted in the decay of 90Sr damage the bone marrow.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false
Answer» The correct option is (a). Explanation: Assertion is true 9038Sr decays to 9039Y by the emission ofβ-rays. Sr gets absorbed in bones along with calcium. Reason is also true.90Sr +β---->90Y Strontium decays to Yitrium. This emitsβ-rays of very high energy. Sr does not emitγ-rays. The damage is by theβ-rays only.

Assertion: 90Sr 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 energeticβ-particles emitted in the decay of 90Sr damage the bone marrow.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not correct explanation of A(c) A is true but R is false(d) A and R are false

Answer»

The correct option is (a).

Explanation:

Assertion is true 9038Sr decays to 9039Y by the emission ofβ-rays. Sr gets absorbed in bones along with calcium.

Reason is also true.90Sr +β---->90Y

Strontium decays to Yitrium. This emitsβ-rays of very high energy. Sr does not emitγ-rays. The damage is by theβ-rays only.