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If half-life of a substance is 5 yrs, then the total amount of substance left after 15 years, when initial amount is 64 grams is__________.

If half-life of a substance is 5 yrs, then the total amount of substance left after 15 years, when initial amount is 64 grams is__________.

Grade:11

2 Answers

upender surepally
126 Points
11 years ago

If half-life of a substance is 5 yrs, then the total amount of substance left after 15 years, when initial amount is 64 grams is 8 grams.

Sambasiva
14 Points
6 years ago
Half life = 5 years
Initial amount of substance =64 grams
Total time elapsed T = 15 years
for 5 years 64 g ------------32 g
for 10 years 32 g-----------16 g
for 15 years 16 g-----------8 grams.

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