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A radioactive element has a half life of 4 days. The fraction that has decayed...

Physics
JAMB 2006

A radioactive element has a half life of 4 days. The fraction that has decayed in 16 days is?

  • A. (15)/16
  • B. (1)/16
  • C. (3)/4
  • D. (1)/4
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Correct Answer: Option A
Explanation

16 days = 4 half-lives.
The fraction left 16 days = after 4 half live, = (1/2)4 = (1)/16

Fraction that decayed = 1- \(\frac{1}{16}\)

 \(\frac{15}{16}\)


 

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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995