The half-life of is 8 days

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

Problem

The half-life of

{}^{131}\text{I}

is 8 days. Given a sample of

{}^{131}\text{I}

at time

t = 0

, we can assert that (1) no nucleus will decay before

t = 4

days (2) no nucleus will decay before

t = 8

days (3) all nuclei will decay before

t = 16

days (4) a given nucleus may decay at any time after

t = 0