1.

An element has half-life 1600 years. The mass left after 6400 years will be

Answer»

`1//16`
`1//12`
`1//4`
`1//32`

Solution :`T_(1//2) = 1600 yrs, N_(0) = 1, N = ?, T = 6400 yrs`
`T = t_(1//2) XXN, or n = (6400)/(1600) = 4`
`N = N_(0) xx ((1)/(2))^(n), N = 1 xx N = (1)/(16)`


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