Question

a radioactive sample has a decay constant of 1.26 x 10^(-3) h ^(-1). what is its half-life​

Answer 1

Explanation:

57 is the correct answer

Answer 2

Answer:

A radioactive sample has a decay constant of 1.26 x 10^(-3) h ^(-1), its half-life​ is $0.55*10^{3}hrs$

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 decay constant λ =$1.26*10^{-3}h^{-1}$

put the value in the above equation

⇒ the half-life of certain species  = $t_{1/2} =\frac{0.693}{1.26*10^{-3} }=0.55*10^{3}hrs$