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A radioactive nucleous A with a half ...

A radioactive nucleous A with a half - life T , decays into a nucleis B . At t=0 , there is no nncleus B . At sometime t , the number of B to that of A is 0.3 . Then , t is given by

A

`t = (T )/(2) ( log 2) /( log 1.3 )`

B

`t=T (log 1.3 ) /( log 2) `

C

` t=T log ( 1.3 ) `

D

`t= (T ) /( log ( 1.3 ))`

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