1.

The half`-` life periof of a radioactive element is 140 days. After 560 days, one gram of the element will reduce toA. `(1)/(2)g`B. `(1)/(4)g`C. `(1)/(8)g`D. `(1)/(16)g`

Answer» Correct Answer - D
`T=nxxt_(1//2)`
`:. n=(T)/(t_(1//2))=(560)/(140)=4`
Now, ` N_(t)=N_(0)((1)/(2))^(n)=1xx((1)/(2))^(4)=(1)/(16)g`


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