Two radioactive species and have their decay constant respectively

CHEMISTRY · Subjective · US High School · Chemistry · Atomic Structure & Nuclear · Atomic Structure & Nuclear

Problem

Two radioactive species

A

and

B

have their decay constant

10 : 1

respectively. Both have initially the same number of nuclei. After time

t

, the ratio of nuclei of

A

and

B

becomes

\frac{1}{e}

. The average life of

A

will be

a \times t

. What is

a