Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: A red object appears dark in the yellow light. Reason: The red colour is scattered less.A) If both assertion and reason are true and reason is the correct explanation of assertion
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
Correct Answer: A
Solution :
\[_{\text{38}}\text{S}{{\text{r}}^{\text{90}}}\]decays to \[39{{\Upsilon }^{90}}\] when \[\beta -\] emission is occurred. Sr gets absorbed in bones along with calcium which causes impairment of the production of red blood cells So, assertion is true. Now \[S{{r}^{90}}\xrightarrow{\beta }{{\Upsilon }^{90}}\] Sr decays to Yttrium. \[\text{S}{{\text{r}}^{\text{90}}}\]emits \[\beta -\] rays of very high energy. Bone marrow is damaged by these high energetic \[\beta -\]particles. So, reason is also true
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