A radioactive substance has a half-life of 3 days. If a m...
A radioactive substance has a half-life of 3 days. If a mass of 1.55g of this substance is left after decaying for 15 days, determine the original value of the mass
49.6g
37.2g
24.8g
12.4g
Correct answer is A
1→12→14→18→116→132
132=1.55g
1 = 1.55 x 321=49.6g
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