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Question

16 g of radioactive radon is kept in a container. How much radon will disintegrate in 19 days? Half life of radon is 3.8 days.


A

0.5 g

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B

5.5 g

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C

10.5 g

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D

15.5 g

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Solution

The correct option is D

15.5 g


Number of half lives in 19 days is
n=19 days3.8 days=5
Number of atoms left undecayed aftr 19 days is
N=N0(12)5=N032=16 g32=0.5g
Hence the correct choice is (d).


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