2 Answers

Venkatesh Wadawadagi · Answer 1 · 2017-06-27T01:12:42+0000

A half life of 2 years means the mass will half every two years. After two years the 100 grams will become 100/2 = 50 grams. Therefore it will take 2 years to decay to a mass of 50 grams.

Slawa Eremin · Answer 2 · 2017-07-01T05:34:19+0000

Answer: 2 years.

Step-by-step explanation:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

Half life is represented by
$t_{(1)/(2)$

$t_{(1)/(2)=(0.693)/(\lambda)$

$\lambda$ = rate constant

As the initial amount of 100 grams is decaying to mass of 50 grams which is half of initial value, it will take 2 years for the decay.

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