Question

the half life of a radioactive substance is 13 years the decay constant is

Answer 1

Answer:

Explanation:

Half-life is defined as the amount of time it takes a given quantity to decrease to half of its initial value. The term is most commonly used in relation to atoms undergoing radioactive decay, but can be used to describe other types of decay, whether exponential or not. One of the most well-known applications of half-life is carbon-14 dating.

N=Ṇe^(-(decay constant)t)

So, half life for given substance will be about 130.78 years

Answer 2

The half life of a radioactive substance is 13 years the decay constant is 0.0533 s⁻¹.

Explanation:

The half life with decay constant is given as:

T1/2 = 0.693/λ

Where,

λ = Decay constant = ?

T1/2 = Half life = 13 years (Given)

On substituting the values, we get,

13 = 0.693/λ

λ = 0.693/13

∴ λ = 0.0533 s⁻¹