The half life of a radioactive element ...

The half life of a radioactive element is 30 min. One sixteenth of the original quantity of element will be left after
a. 1 hr b. 16 hr c. 4 hr d. 2 hr

A

60 min

B

120 min

C

70 min

D

75 min

Verified by Experts

The correct Answer is:

B

`1/(16) = 1/(2^n) "or " 1/(2^4) = 1/(2^n) or n = 4 `
`therefore` Required time `= 4 xx t_(1//2) = 120` min

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