13.Nuclei
medium

$\alpha$ -क्षयित हो रहे किसी रेडियोएक्टिव नमूने की अर्धायु $1.4 \times 10^{17}\, s$ है । यदि इस नमूने में नाभिकों की संख्या $2.0 \times 10^{21}$ है, तो इस नमूने की सक्रियता है, लगभग

A

$10^{3} \;Bq$

B

$10^{4}\;Bq$

C

$10^{5}\;Bq$

D

$10^{6}\;Bq$

(NEET-2020)

Solution

The activity (A) is defined as the rate of decay of radioactive substance.

$A=-\frac{d N}{d t}=N \lambda$

$A = N \times \frac{0.693}{ T } \quad[ T$ is half life $]$

$A=2 \times 10^{21} \times \frac{0.693}{1.4 \times 10^{17}}$

$A=10^{4} B q$

Standard 12
Physics

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