Question

The decay constant of

{ }^{238} \mathrm{U}

is

4 .9 \times 10^{-18} \mathrm{~s}^{-1}

.
(a) What is the average-life of

{ }^{238} \mathrm{U}?

(b) What is the half-life of

{ }^{238} \mathrm{U}?

(c) By what factor does the activity of a

{ }^{238} \mathrm{U}

sample decrease in

9 \times 10^9

years?

Accepted Answer

(a) $6.49 	imes 10^9 \mathrm{~y};$ (b) $4.5 	imes 10^9 \mathrm{~y};$ (c) 4

Answer

(a) $6.49 	imes 10^9 \mathrm{~y};$ (b) $5.4 	imes 10^9 \mathrm{~y};$ (c) 4

Answer

(a) $4.46 	imes 10^9 \mathrm{~y};$ (b) $4.5 	imes 10^9 \mathrm{~y};$ (c) 9

Answer

(a) $6.49 	imes 10^{17} \mathrm{~y};$ (b) $4.5 	imes 10^18 \mathrm{~y};$ (c) 5

JEE PHYSICS MCQ: NUCLEI

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