Question

$\huge{\boxed{Question \::-}}$

→ 256 gm of a radioactive substance decreases to 2mg in 400 days . What is the half life of radioactive substance ?

(A) 48.34 days

(B) 57.14 days

(C) 63.24 days

(D) 73.72 days ​

Answer 1

option B

solution is in the attached pic...

Answer 2

$\huge{\boxed{Answer \::-}}$

→ 256 gm of a radioactive substance decreases to 2mg in 400 days . What is the half life of radioactive substance ?

(A) 48.34 days

(B) 57.14 days

(C) 63.24 days

(D) 73.72 days