Question

50% of a radio active substances decay in 5 hours. the time required for the 87.5% decay is

Answer 1

Answer:

It's in direct proportion .

Hence, x/y is constant

Let 5=x and 50%=y

x/y=1/10

Hence,

x/87.5=1/10

x=87.5/10

x=8.75

Hence,

x= 8 hours and 45 minutes.

It will take 8 hours and 45 minutes to decay 87.5% of radio active substances.