A sample of 320 g of a radioactive isotope has a half-life of 5 days. How much remains after 20 days?

Answer and explanation

Correct answer: C. 20 g

  1. Step 1: 20 days is 4 half-lives.
  2. Step 2: 320 x (1/2)^4 = 20 g.
Answer
20 g.

Practise more Functions and Algebra.

Free questions with an explanation for every one, and full timed Ontario Secondary School Diploma (OSSD) mock tests.

All Functions and Algebra questionsTake a mock test

More Functions and Algebra questions