Question

If half life of a radioactive element is 3 hours after 27 hours it activity becomes ______.

विकल्प

• `1/32`

• `1/512`

• `1/8`

• `1/264`

Answer 1

If half life of a radioactive element is 3 hours after 27 hours it activity becomes `underline(1/512)`.

Explanation:

A = `"A"_0 [1/2]^("t"/("T_(1/2)))`

`"A"/"A"_0 = [1/2]^(27/3) = [1/2]^9 = 1/512`

`"A"/"A"_0 = 1/512`