Question

a 500 kilogram sample of substance decays to 125 kilograms over a period of 21.53 years. what is the half life of the sample substance

Answer 1

Half life = 10.765 year

Step-by-step explanation:

Given data:

Mass of sample = 500 Kg

Mass left after 21.53 years = 125 kg

Half life of substance = ?

Solution:

At tome zero = 500 kg

At 1st half life = 500 kg/2 = 250 kg

At 2nd half life = 250 kg/2 = 125 g

Half life:

Half life = time elapsed / number of half life

Half life = 21.53 year/2

Half life = 10.765 year