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Q.

The half life of  92U238 undergoing α - decay is 4.5 x 109 years. The activity of 4g sample of U 238 92  is 

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a

4.9 x104 Bq

b

1.23 x 104 Bq

c

1.23 x105 Bq

d

4.9 x106 Bq

answer is C.

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Detailed Solution

A=λN ∵T1/2 in sec =1.42×1017sec=0.693T1/2×mM×NA=0.6931.42×1017×4238×6×1023=4.9×104Bq

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