Question

80g of a radioactive material is allowed to decay for 15 days. Tje mass left undecayed after this period is 2.5g. Calculate the half life time

Answer 1

Answer:

The half life (T1/2) = 3 days

Explanation:

N = 2.5 g

No = 80 g

$\frac{N}{N_{0} }=( \frac{1}{2}) ^{n}$

     =  $(\frac{2.5}{80}) ^{n}$

     = $(\frac{1}{32}) ^{n}$

n = 5

n = T / T1/2

T 1/2 = T /n

         = 15 /5  = 3 days