Question

Cobalt-60 has a half-life of about 5 years. How many grams of a 300 g sample will remain after 20 years? A: 0.0625 g

Answer 1

Your question: Cobalt-60 has a half-life of about 5 years. How many grams of a 300 g sample will remain after 20 years?

Answer: C. 18.75g

That's your answer, good luck mate. Remember to always look through notes, so-forth.

Answer 2

The answer is letter c