Question

Question 16:-
Fluorine-18 is a radioactive isotope of fluorine that is used in medical imaging scans. It has a
half-life of approximately 110 minutes. If a patient has a medical imaging scan using an
injection of fluorine-18 at 9 am, at what time will there be less than 25% of the radioactive
isotope in her body?
a) 10 am
b) 12 pm
c) 1 pm
d) 11 am
Question 17:-​

Answer 1

Answer:

option (a) is correct !!!

hope it helps you !!

Answer 2

Step-by-step explanation:

Given data:-

Here it takes $110$ minutes for half life

It means for 1 half life $(50\%)$ needs $110 minutes$

 Then for $2$ half lives $(50/2=25\%)$ needs $110+110$

i.e., $220 minutes$

 $[220 minutes=3hours 40 minutes]$

Hence after $3hours 40 minutes$ from $9am$ it is $1pm.$