agentnerdo
Sep21-10, 12:25 PM
The conc.of molecules in two ultra-high-vacuum chambers of volumes V1=V2=0.1m^3 is 10^6 molecules/m3
You count the # of molecules N1 and N2, in each chamber at some moment of time.
a.find the expectation value and the SD of N1 and N2 . calc \sigma_{N1}, sketch the prob distribution of N1.
I used SD= sqt(pq) x sqt(N)
=sqt(0.5x0.5) x sqt (2,000,000)
=707.1
I assume for Expectation value i use
W= \underline{N!}(v/V) (1-v/V)^{N-n}
n!(N-n)!
I am just sure if N will be 2million, or even what my n will be...
any help be appriciated!
You count the # of molecules N1 and N2, in each chamber at some moment of time.
a.find the expectation value and the SD of N1 and N2 . calc \sigma_{N1}, sketch the prob distribution of N1.
I used SD= sqt(pq) x sqt(N)
=sqt(0.5x0.5) x sqt (2,000,000)
=707.1
I assume for Expectation value i use
W= \underline{N!}(v/V) (1-v/V)^{N-n}
n!(N-n)!
I am just sure if N will be 2million, or even what my n will be...
any help be appriciated!