JEE PHYSICS MCQ: NUCLEI

1 Medium

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Application +4 | -1

A radioactive element decays by

\beta

-emission. A detector records

\mathrm{n}

beta particles in

2 \mathrm{~s}

and in next

2 \mathrm{~s}

it records

0.75 \mathrm{n}

beta particle. Find mean life correct to nearest whole number.
Given

\ln 2=0.6931

, (n

3=1.0986

View answer and explanation

Correct option: B

7 \mathrm{~s}

Option B (7 s) is correct because the mean life is calculated using the decay constant derived from the given beta particle counts over two consecutive time intervals.

JEE PHYSICS MCQ: NUCLEI

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