Average relative velocity in calculating mean free path

  • Thread starter dsdsuster
  • Start date

Answers and Replies

  • #2
Simon Bridge
Science Advisor
Homework Helper
17,856
1,654
Try it and see what happens when you use the mean-relative-velocity. ;)
 
  • #3
30
0
Thanks Simon,

I'm not really following. The mean-relative-velocity would be 0 since velocity is a vector. I think I meant to say mean-relative-speed. I would expect the mean-relative-speed to be less than the rms-relative-speed but that's about it.

Thanks
 
  • #4
Simon Bridge
Science Advisor
Homework Helper
17,856
1,654
Ri-ight - so, look through your notes about mean free path, where it is applied (say: brownian motion) and use your idea of the mean-speed instead of the rms speed. (You'll have to adjust the derivation to account for the difference.) See what you get.

I could go and just describe in words why the rms speed is preferred etc etc ... but that's a lot of typing when I can just make you do the math. You asked the question: are you prepared to find the answer?
 

Related Threads on Average relative velocity in calculating mean free path

Replies
3
Views
2K
  • Last Post
Replies
2
Views
743
Replies
12
Views
3K
Replies
1
Views
2K
  • Last Post
Replies
1
Views
1K
Replies
5
Views
6K
Replies
1
Views
5K
  • Last Post
Replies
15
Views
3K
  • Last Post
Replies
9
Views
4K
Replies
17
Views
2K
Top