Question

do you have period of radioactive element is 90 minutes what percentage of radioactive element will be present after 6 hours of decomposition​

Answer 1

Answer:

Explanation:

As half life of the element  of element is 90 minutes it means every 90 minutes or 1 hr 30 minutes the amount of radioactive substance = half of original amount

Let total amount of substance at beginning = X

So u can use the formulae that amount of substance left after n half life = $\frac{1}{2ⁿ}$ times the initial amount if substance

In 6 hrs no of half life = 6/1.5 = 4 half lives

hence amount of substance left after 4 half lives = 1/2⁴ times X = X/16

hence per centage =  $\frac{X}{16X}$ * 100 = 6.25 per cent