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Problem
The half-life of the radioactive radon is 3.8 days. The time, at the end of which
1
20
\frac{1}{20}
20
1
th of the radon sample will remain undecayed, is (given
log
10
e
=
0.4343
\log_{10} e = 0.4343
lo
g
10
e
=
0.4343
) (JEE 1981) a. 3.8 days b. 16.5 days c. 33 days d. 76 days
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