NEET UG PHYSICS MCQ: NUCLEI

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Application +4 | -1

A count rate metre shows a count of

\mathrm{240}

per minute from a given radioactive source later the metre shows a count rate 0f

30\,\,{\min ^{ - 1}}

⁡ . The half-life of the source is

View answer and explanation

Correct option: C

\mathrm{20}\,\mathrm{ min}

Option C (

\mathrm{20}\,\mathrm{ min}

) is correct because after two half-lives, the count rate reduces to 1/4 of its initial value.

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\mathrm{216}

\mathrm{125}

{ }_{92} X^{236} \rightarrow{ }_{56} Y^{141}+{ }_{36} Z^{92}+3 R

({R})

{R_0}\; = \mathrm{ }1.3fm

\left({ }_0^1 \mathrm{n}\right)

\left({ }_{92}^{235} \mathrm{U}\right)

1\,\,a.m.u = 931\,\,MeV