Question

4. What is the half-life of the radioactive isotope with amount A, whose rate of decay in t hours is shown in the graph below?

(0,40)
(20,15)

Answer 1

Answer:The half life is the time taken for the amount of a substance to become half of its original value. If we take the initial value to be 30 on the y-axis, the half of 30 is 15. We check the time at which the substance has reduced to 15 atoms and this is about 40 seconds. The answer is C.

Explanation:

Answer 2

15, 25

Explanation: