Help exponential modelling q

Alevelhelp.1

Help I don’t get why m0 is 400 for part a

(edited 1 year ago)

Reply 1

davros

Original post by Alevelhelp.1

Help I don’t get why m0 is 400 for part a

The scientist drinks two cups of strong coffee, and each cup contains 200mg of caffeine, so ...

Reply 2

Alevelhelp.1

Original post by davros

The scientist drinks two cups of strong coffee, and each cup contains 200mg of caffeine, so ...

Ahh I see…. But why is m equal to 200 then??

Reply 3

davros

Original post by Alevelhelp.1

Ahh I see…. But why is m equal to 200 then??

You're trying to find the value of the parameter k by using the information that the amount of caffeine halves in 5.7 hours. So 400mg is the initial amount (m_0), 200mg is the amount once it's halved, and you know that t = 5.7 at this point. So you can set up an equation to get the value of k. Is this not clear from the markscheme?