Question

The half life of Th232 is 1.4 × 1010 years and that

of its daughter element Ra238 is 7 years. What

amount (most nearly) weight of Ra238 will be in

equilibrium with 1gm of Th232 ?

(A) 5 × 10–10gm (B) 5.0 gm

(C) 1.95 × 10–9 gm (D) 2 × 10–10 gm​

Answer 1

Note: Check this attachment.

Therefore:

Correct option: (A) 5 × 10^-10 gm

Answer 2

Explanation:

The half life of Th232 is 1.4 × 1010 years and that

of its daughter element Ra238 is 7 years. What

amount (most nearly) weight of Ra238 will be in

equilibrium with 1gm of Th232 ?

(A) 5 × 10–10gm (B) 5.0 gm

(C) 1.95 × 10–9 gm (D) 2 × 10–10 gm