If the fraction of the atoms of a radioactive material left after 120 years is 1/64, what is the half-life of the material?

Assessment: JAMB UTME - Physics - 2021 Subject: Physics

Question 1 Report

If the fraction of the atoms of a radioactive material left after 120 years is 1/64, what is the half-life of the material?
Answer Details

Given amount remaining = 164 1 64

= 164=1(2)6 1 64 = 1 ( 2 ) 6

∴ ∴  = 120years6 120 years 6  = 20 years

⇒ ⇒  T12 1 2  = 20 years

Read lesson note on Electromagnetic Field (Part 2) (WAEC)
View Answer

Related Questions

1

A given mass of gas has a pressure of \(80\ \mathrm{Nm}^{-2}\) at a temperature of \(47\ \mathrm{C}\). If the temperature is reduced to \(27\ \mathrm{C}\) wi...
2

Which of the units of the following physical quantities are derived? I. Area II. Thrust III. Pressure IV. Mass
3

The slope of the straight line displacement-time graph indicates?
4

0.5kg of water at 10ºC is completely converted to ice at 0ºC by extracting (88000) of heat from it. If the specific heat capacity of water is 4200jkg\(^{1}\)...
5

The motion of a body is simple harmonic if the?
6

Which of the following is not correct about the molecules of a substance in a gaseous state. They?
7

A man will exert the greatest pressure when he?
8

A ball of mass 0.5kg moving at \(10\text{ms}^{-1}\) collides with another ball of equal mass at rest. If the two balls move off together after the impact, ca...

Download The App On Google Playstore

Everything you need to excel in your exams

Green Bridge CBT Mobile App
Personalized AI Learning Chat Assistant
200,000+ Exam Questions Across IGCSE, JAMB, WAEC & NECO
Over 3,900 Lesson Notes
Offline Support - Learn Anytime, Anywhere
Green Bridge Timetable
Literature Summaries & Potential Questions
Track Your Performance & Progress
In-depth Explanations for Comprehensive Learning