1.

If n_t number of radiatoms are present at time t, the following expression will be a constant.

Answer»

`n_t//t`
`LN n_t//t`
`d ln n_t//dt`
`t cdot n_t`

Solution :`-(dn_t)/(dt) = LAMBDA n_t implies - 1/(n_t) (dn_t)/(dt) = lambda`
`implies d/(dt) (ln n_t) = -lambda`, a constant.


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