1.

The half-life of a radioactive element is 10 hours. How much will be left after 4 hours in 1 g atom sample ?

Answer»

`45.6 XX 10^(23)` atoms
`4.56 xx 10^(23)` atoms
`4.56 xx 10^(24)` atoms
`4.56 xx 10^(25)` atoms

SOLUTION :`N_t = N_0 (1/2)^(n)`
`n = 4//10`
`:. N_t = 6.022 xx 10^(23) xx (1/2)^(0.4) = 4.56 xx 10^(23)`


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