Question on: WAEC Physics - 2003
A radioactive element has a decay constant of 0.077s-1, calculate its half life
A
12.5s
B
9.0s
C
5.1s
D
0.5s
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Correct Option: B
T = \(\frac{0.692}{\lambda} = \frac{0.692}{0.077}\)
= 9s
= 9s
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