Question

The half life for radioactive sample is 1386 s then its decay constant is

Answer 1

Answer:

• .639\1386= 5×10^-4 as the half life of first order rxn is .639/k

Answer 2

Answer:

The half-life of a certain radioactive species is 1386s, its decay constant​ is 0.0005

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 $t_{1/2} =1386s$

put the value in the above equation

⇒ the decay constant λ = $\frac{0.693}{1386}=0.0005$