Question

if average lifetime of radioactive substance is 5 days then find its half life time​

Answer 1

Answer:

To find the half life of a substance, or the time it takes for a substance to decrease by half, you'll be using a variation of the exponential decay formula. Plug in ½ for a, use the time for x, and multiply the left side by the initial quantity of the substance.

8. After five half-lives what will be the fraction of initial substance remaining undecayed

                     (A) (1/2)10                            (B)    (1/2)5  

                     (C) (1/2)4                              (D)    1/2

Solution: It is quite obvious that after five half-lives, the fraction of the initial substance remaining is given by

N/N0 = (1/2)5, which given (B) as the correct option.

Explanation:

Answer 2

ohkk fine no problem.......