1.

If n_(1) is the number of radio-atoms present at tiem 't' the following expression will be a constant,

Answer»

`(n_(t))/(t)`
`(In n_(t))/(t)`
`(d In n_(t))/(dt)`
`t n_(t)`

SOLUTION :`(d n_(t))/(dt) = LAMBDA n_(t)`
`(1)/(n_(t)) (d n_(t))/(dt) = lambda`
`(d)/(dt) (l_(n) n_(t)) = -lambda` constant 1


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