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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

A.

49.6g

B.

37.2g

C.

24.8g

D.

12.4g

Correct answer is A

1121418116132

132=1.55g

1 = 1.55 x 321=49.6g