Of (half-life ) is sealed in a container

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

Problem

1.00\,\text{g}

^{131}\text{I}

(half-life

8\,\text{days}

) is sealed in a container. What mass of the isotope will remain undecayed after

24\,\text{days}

? (a)

0.250\,\text{g}

(b)

0.875\,\text{g}

(c)

0.125\,\text{g}

(d)

0.0625\,\text{g}