The rate of disintegration of a radioactive substance falls from 800 decay/min to 100 decay/min in 6 hours. The half-life of the radioactive substance is:
2 hr
1 hr
6/7 hr
3 hr
A
1 hr
B
2 hr
C
3 hr
D
6/7 hr
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Solution
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A=A0e−λt
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