Question

1. If half-life of a substance is 5 yrs, then the total
amount of substance left after 15 years, when initial
amount is 64 grams is
(a) 16 g
(b) 2 g
(c) 32 g
(d) 8 g
(2002)​

Answer 1

Answer:

16g

Explanation:

Answer 2

Answer:

16 g

Explanation:

Half life is nothing but the time period after which the amount of a radioactive substance will be half of the initial amount taken .....

so, after 5 years 64\2 g = 32g

and after another 5 years 32\2= 16 g will be left .

hope u have understood my explanation ...