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PHYSICS

JAMB 2007 - Question 10

Physics 2007 JAMB Past Questions - Question 10: A radioactive substance has a half-life of 20 days. What fraction of the original nuclei will remain after 80 days?

Choose the correct answers from the options given.

A radioactive substance has a half-life of 20 days. What fraction of the original nuclei will remain after 80 days?

A: 1/16

B: 1/8

C: 1/4

D: 1/32

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Correct Answer

Explanation

80 days = 4 half lives (i.e 4 x 20dqs = 80dq)

But the fraction always left by any radioactive material after 4 half lives is

(1/2)^4 = 1/16