How long will it take for 80% of a 1.20mg sample of Rn-220 to decay? The half-life of Rn-220 is 55.6 seconds.
A. 17.9 seconds
B. 55.6 seconds
C. 111 seconds
D. 129 seconds
E. 222 seconds
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Based on our data, we think this problem is relevant for Professor Stackpool's class at Minnesota State University - Mankato.