Which halflife formula is correct?

  • Thread starter Thread starter huan.conchito
  • Start date Start date
  • Tags Tags
    Formula
Click For Summary
SUMMARY

The correct half-life formula is Al = Ao(1/2)^(t/h), where Ao represents the original amount, Al is the remaining amount after time t, t is the elapsed time, and h is the half-life. This formula is derived from the exponential decay equation, which accurately describes the relationship between the remaining quantity of a substance and the time that has passed. Using the incorrect formula, Al = Ao(1/2)^(h/t), leads to inaccurate calculations regarding the decay of substances.

PREREQUISITES
  • Understanding of exponential decay equations
  • Familiarity with half-life concepts in physics and chemistry
  • Basic knowledge of algebraic manipulation
  • Ability to interpret scientific formulas and variables
NEXT STEPS
  • Study the derivation of the exponential decay equation
  • Learn about radioactive decay and its applications in various fields
  • Explore the implications of half-life in pharmacokinetics
  • Investigate real-world examples of half-life calculations in environmental science
USEFUL FOR

This discussion is beneficial for students in physics and chemistry, researchers in radioactive materials, and professionals in fields requiring precise calculations of decay rates.

huan.conchito
Messages
44
Reaction score
0
Which half - life formula is correct? Please help

is it
Al = Ao(1/2)^(t/h)
or
Al = Ao(1/2)^(h/t)
?
where Ao =original amount
Al = amount left
 
Last edited:
Physics news on Phys.org
Well, what do YOU think? Suppose t were equal to 2h.

The first formula gives AI= Ao(1/2)^(2h)= Ao((1/2)^h)^2 which is less than the amount at the half life.

The second formula gives AI= A0(1/2)^(h/2)= A0((1/2)^h)^(1/2) which is more than the amount at the half life.

If you let this (radioactive subtance?) sit longer, will it gain or lose mass?
 
after time t
t = time
h = half-life

The correct half-life formula is Al = Ao(1/2)^(t/h), where Ao is the original amount, Al is the amount left after time t, t is the time, and h is the half-life. This formula is derived from the exponential decay equation, which shows the relationship between the amount of a substance remaining and the time passed. It is important to use the correct formula to accurately calculate the half-life and understand the rate at which a substance decays.
 

Similar threads

Replies
4
Views
2K
Replies
5
Views
1K
Replies
12
Views
2K
  • · Replies 9 ·
Replies
9
Views
1K
Replies
5
Views
1K
  • · Replies 3 ·
Replies
3
Views
1K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 4 ·
Replies
4
Views
3K
Replies
3
Views
2K
  • · Replies 12 ·
Replies
12
Views
1K