The half-life of a radioactive element is equal to the mean lifetime of another…

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

Problem

The half-life of a radioactive element

X

is equal to the mean lifetime of another radioactive element

Y

. Initially, both have the same number of atoms. Then: (1)

X

and

Y

have the same decay rate initially. (2)

X

and

Y

decay at the same rate always. (3)

Y

will decay at a faster rate than

X

. (4)

X

will decay at a faster rate than

Y