Two radioactive materials and have decay constants and

PHYSICS · Single correct · CBSE · Physics · Nuclei · Nuclei

Problem

Two radioactive materials

X_1

and

X_2

have decay constants

10\lambda

and

\lambda

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

X_1

to that of

X_2

will be

1/e

after a time (1)

\frac{1}{10\lambda}

(2)

\frac{1}{11\lambda}

(3)

\frac{11}{10\lambda}

(4)

\frac{1}{9\lambda}