ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Physics => Topic started by: milkymoo on October 10, 2008, 03:44:34 pm

Title: interactions of light and matter formula collection
Post by: milkymoo on October 10, 2008, 03:44:34 pm

Hey all
Considering the amount of frustration I have while studying this topic, mainly due to the fact of the many, tricky formulas to use, I have made a list of formulas that can be used to find out p, λ, V and E. Feel free to add your own in that i've missed, and please speak up if I have made a mistake in any of them!

p = mv = h/λ  = E/c = √(2mE) = √(2mqV)
λ = h/p = h/(mv) = h/(√(2mqv)) = h/(√(2mE))
V = h^2/(2mqλ^2 )  = (mv^2)/(2q) = √(2E/m) = p^2/(2mq)
E = qv = 1/2 mv^2= cp = h^2/(2mλ^2 ) = p^2/2m

Hope this helps you in your studies!

Title: Re: interactions of light and matter formula collaberation
Post by: cara.mel on October 10, 2008, 03:49:43 pm

1/2 mv^2 can be rewritten as p^2/2m if that is useful (I dont know, I forget what's in VCE physics)

Title: Re: interactions of light and matter formula collection
Post by: milkymoo on October 10, 2008, 03:57:10 pm

Thanks for that. I've updated original post to include that

Title: Re: interactions of light and matter formula collection
Post by: Ken on October 19, 2008, 12:02:11 pm

p = mc?

Title: Re: interactions of light and matter formula collection
Post by: cara.mel on October 19, 2008, 12:05:13 pm

Quote from: Ken on October 19, 2008, 12:02:11 pm

p = mc?

things with mass tend not to go at the speed of light :P
(use p=mv, v won't = c)