What is the rate of decay of awesome-10 which has a half-life of 650 days?

Question

anonymous · Answer

I can't figure out how to solve these rate of decay questions, so I just made up my own as a way to help me learn this. How would I solve this?

anonymous · Answer

if it has a half life of 650 time units it means every 650 time units 1/2 of the samle dissapears.

anonymous · Answer

Yep. :) How would I find the rate of decay, though?

anonymous · Answer

halflife= -ln2/k  
that is the half life equation

anonymous · Answer

I have a formula $$N=N _{0}e ^{kt}$$
How/where would I plug everything in?

anonymous · Answer

I'm not sure I understand @Spectrum

anonymous · Answer

I know spectrum

anonymous · Answer

i gave him all right answers

anonymous · Answer

for his teset
 he did good to

anonymous · Answer

I think they are asking for k
you got N=1/2No
t=650
so you plug all numbers in and find k

anonymous · Answer

I mean, I don't understand what he meant. I'm having a lot of trouble with logarithms, so I'm not quick on my feet. :P

anonymous · Answer

$$N=\frac{ 1 }{ 2 }N _{0}^{650k}$$
Okay, so what do I do next?

anonymous · Answer

Would I put some test number in for No? Like 100 or something?

anonymous · Answer

no,|dw:1354966748637:dw| you plug 1/2No for Nthen you can simplify for No