1.

Radium has atomic weight 226 and a half-life of 1600 years. The number of disintegrations produced per second from 1g are

Answer»

`4.8 XX 10^(10)`
`9.2 xx 10^(6)`
`3.7 xx 10^(10)`
Zero

Solution :`R = (0.693)/(t_(1//2)) xx N_(0) = (0.693)/(1600 xx 365 xx 24 xx 60 xx60) xx(6.023 xx 10^(23))/(226)`
`= 3.7 xx 10^(10)`dps


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