struggling with a logarithm revision question on radioactive decay: can anyone help? watch
Last edited by Sam00; 05-04-2016 at 03:35.
- 05-04-2016 00:52
- 05-04-2016 00:58
I literally just put 4e^-0.2t in my calculator
(Original post by Sam00)
- 05-04-2016 01:29
The mass kg of a radio-active substance remaining in a sample t years after starting timing is given by theequation 'x = 4e^-0.2t'
a) What was the mass at the start ofthe timing?
b) Find the mass left after 5 years
So far I have only worked out some of (a) and got an answer of 3.275kg, which I think is incorrect
I've never done A level chemistry but could you do when t=0 to get an initial mass of 4kg...
I believe you could also make a graph.Last edited by Hōseki; 05-04-2016 at 01:37.
- 05-04-2016 01:44
Ahh it looks like chemistry, I'm doing my AS's atm so I'm not familiar. After checking the graph for the equation, I believe the answer to part b is 1.5kg.
- 05-04-2016 10:29