NEET UG PHYSICS MCQ: NUCLEI

1 Medium

1 of 1

Analyzing +4 | -1

It is observed that only

0.39 \%

of the original radioactive sample remains undecayed after eight hours select the incorrect statement :-

View answer and explanation

Correct option: D

If the number of radioactive nuclei of this substance at a given instant is

10^8

then the no. left after

30 {~min}

would be

\sqrt{2} \times 10^7

Option D (If the number of radioactive nuclei of this substance at a given instant is

10^8

then the no. left after

30 {~min}

would be

\sqrt{2} \times 10^7

) is incorrect because the half-life is 1 hour, and after 30 minutes (half a half-life), the remaining amount is not simply related by a factor of

\sqrt{2}

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\mathrm{216}

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{ }_{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