The rate of decrease of the radioactive element is 8% per hour.
We have equation that gives the amount in kilograms of a radioactive element that remains after t hours.
We have to determine rate of decrease of this radioactive element.
<h3>What is the general equation for the radioactive decay of an element?</h3>
The general equation that describes the radioactive decay is given by -
Where,
A₀ is the original amount of the substance, A is the amount after time t, r is the rate of decrease of this radioactive element.
We can use the above equation to solve the question given -
On comparing this with the general equation of radioactive element decay, we get -
1 - r = 0.92
r = 1 - 0.92
r = 0.08
In percentage - 0.08 x 100 = 8%
Hence, the rate of decrease of the radioactive element is 8% per hour.
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