1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Estimate a lower limit for the number density of the electrons in the plasma

  1. Nov 27, 2011 #1
    1. The problem statement, all variables and given/known data

    When a returning spacecraft re-enters the atmosphere, the shock wave and the friction that it generates lead to the ionisation of gas molecules just ahead of it and around it. Because of this, during the most intense phase of deceleration, radio communication signals cannot pass between the spacecraft and the ground. If the highest frequency communications band is in the region of 450 MHz, estimate a lower limit for the number density of the electrons in the plasma that surrounds a spacecraft during radio blackout..

    3. The attempt at a solution

    omega(of plasma)=sqrt[((N(subscript e))e^2)/((m(subscript e)) (espsilon0))

    But it seems like I can't just substitue the numbers in because there is all this about the highest frequecny and the lower limit. The highest frequency won't give the lower limit because omega^2 is proportional to N(subscript e). So what do I do? Thanks if you reply.
     
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted



Similar Discussions: Estimate a lower limit for the number density of the electrons in the plasma
  1. Electron density (Replies: 1)

Loading...