87221Ra undergoes radioactive decay with a half life of 4 days. The probability that a Ra nucleus will disintegrate in 8 days is

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1/2

1/4

3/4

answer is D.

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Detailed Solution

n=tt1/2=84=2; No=2nN;NoN=22=4 Remaining atoms =N=No4 Dacayed atoms =N0−N=N0−N04=3N04∴ Probability of decay =N0−NN0=34

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