JEE 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 (20 min) is correct because it is the half-life that satisfies the decay equation given the initial and final count rates over a period of 60 minutes.

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\mathrm{2}\,\,\mathrm{fermi}

. Find the radius of nucleus with atomic number

\mathrm{189}

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N{e^{22}}

nucleus, after absorbing energy, decays into two

\alpha -

particles and an unknown nucleus. The unknown nucleus is A moderator is used in nuclear reactors in order to Nuclear forces are For uranium nucleus how does its mass vary with volume?