1.

A radioisotope with At. wt. 99 has a half-life of 6 hours. A solution with 10^(-12) gm of this isotope is provided to perum, Then Activity of solution in beginning is

Answer»

`7.02 xx 10^(8)//hr`
`6.5 xx 10^(8)//hr`
`3.21 xx 10^(8)//hr`
`14.05 xx 10^(8)//hr`

Solution :LET M be that at. MASS of neon in a.m.u.
B.E.=mass defect in ENERGY units.
Then, `160.6=(10 xx 1.007825 +10 xx 1.008655-M) xx 931`
`rArr M=19.9924 a.m.u.`


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