Question

The half life of a radioactive sample is 30 days. Find the decay constant of sample.

Answer 1

The formula goes like this ...

T half = 0.693/ decay constant

Therefore

Decay constant = 0.693/30

0.0231 .....is ur answer

Answer 2

Answer:

The half-life of a certain radioactive species is 30days, its decay constant​ is $0.26*10^{-6}$

Explanation:

• The half-life is the time needed to react the half of the sample, the relation connecting half-life life ( $t_{1/2}$ ) and the decay constant (λ) is given by the formula

        λ = $\frac{0.693}{t_{1/2} }$

From the question, we have

the half-life of certain species $t_{1/2} =30days$

since 1 day= 86400 seconds

30days = $2.59*10^{6}s$

put the value in the above equation

⇒ the decay constant λ = $\frac{0.693}{2.59*10^{6} }=0.26*10^{-6}$