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Problem
Problem
A radioactive element disintegrates for a time interval equal to its mean life. The fraction that has disintegrated is a.
1
e
\frac{1}{e}
e
1
b.
1
−
1
e
1 - \frac{1}{e}
1
−
e
1
c.
0.693
e
\frac{0.693}{e}
e
0.693
d.
0.693
(
1
−
1
e
)
0.693 \left(1 - \frac{1}{e}\right)
0.693
(
1
−
e
1
)
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