Two radioactive materials and have decay constants and

PHYSICS · Single correct · A Level · Physics · Nuclear physics · Nuclear physics

Problem

Two radioactive materials

A_1

and

A_2

have decay constants

5\lambda

and

\lambda

, respectively. If initially they have the same number of nuclei, the ratio of nuclei of

A_1

A_2

will be

\frac{1}{e}

after a time: (1)

\frac{1}{4\lambda}

(2)

\frac{e}{\lambda}

(3)

\lambda

(4)

\frac{\lambda}{2}