1.

The mass of 1 curie of U-234 is :

Answer»

`3.7xx10^(10)G`
`2.348xx10^(-23)g`
`3.7xx10^(-10)g`
`1.438xx10^(-11)g`

Solution :1 Curie of a SUBSTANCE is the amount of substance which gives `3.7xx10^(10)` DISINTEGRATIONS per SECOND. NUMBER of disintegrations is proportional to the number of atoms so that `6.02xx10^(23)` atoms of U-234 has mass =234g `3.7xx10^(10)` atoms of U-234 has mass
`=(234)/(6.02xx10^(23))xx3.7xx10^(10)`
`=1.438xx10^(-11)g`


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