Like what you saw?
Create FREE Account and:
- Watch all FREE content in 21 subjects(388 videos for 23 hours)
- FREE advice on how to get better grades at school from an expert
- FREE study tips and eBooks on various topics
Tips for Half-Life Calculations - Concept
M.Ed.,San Francisco State Univ.
Jonathan has been teaching since 2000 and currently teaches chemistry at a top-ranked high school in San Francisco.
Here are some tips and tricks for dealing with half-life calculations. So here I’ve written a simple equation that deals with half-life. And so, we have three different variables. So if you know two of the variables, YOU can solve for the third one related to a half-life calculation.
So just to know, this first n is your number of particles, or your mass after n number of half lives. So that means that this end is lower case AND like I have in quotation marks. This is the number of half lives that have passed. Now remember each half-life for a certain radioactive element, would be the same like the time. So for the first half-life, the first half-life is say time would be 5 seconds. That means the second half-life would also be another 5 seconds.
The third half-life would be another 5 seconds, fourth half-life would be another 5 seconds. So after 4 half lives, then the total would be 20 seconds that you have there. So remember each half-life is identical in terms of amount of time.
But the amount that you have, say if I started off in grams with 10 grams, after the first half-life. Maybe I started off with 20 initially. Then what happens is after the second half-life another half it will drop down and half to 5. And then after another half-life, I would have 2 and a half grams remaining. After another half-life, I would have 1.25.
It’s pretty easier to drop stuff in half, but this equation here will help us figure out just in case we don’t have a whole number for a half-life. Like maybe it’s after 2 and a half lives, how much is left? So n0 is basically the number of particles, or the mass initially. So how much did you start off with at the very very beginning?
Please enter your name.
Are you sure you want to delete this comment?
- Nuclear Reactions 17,393 views
- Radioactivity 12,905 views
- Beta Decay 21,061 views
- Alpha Decay 18,292 views
- Electron Capture 14,098 views
- Nuclear Stability 17,159 views
- Transmutation 9,583 views
- Half-life 23,415 views
- Fission 13,186 views
- Fusion 11,595 views
- Tips About Nuclear Fusion and Nuclear Fission 3,561 views
- Tips for Nuclear Radiation Equations 3,028 views