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Ra226 has half life of 1600 years. The number of disintegration per second per gram is

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a

3.7×1010

b

9.2×106

c

3.7×109

d

3.7×108

answer is A.

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Detailed Solution

K= Number of disintegrations per second Total number of atoms is one gram of RaK=0.693t1/2 or K=0.6931600×365×24×60×60.'. Number of disintegration per second=0.693×6.023×10231600×365×24×6060×226=3.7×1010

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