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!

Homework Help: Electrostatics problem with energy

  1. Jul 17, 2014 #1
    At what minimum distance can a particle 4α2, with kinetic energi Ec=4.77MeV, approach to a radium core 226Ra88.

    This is how I solved it:
    From energy conservation: ΔEc+ΔEp=0


    r2=1/[1/r1+4*∏*ε*Ec/(Z1*Z2*e2)] (1)

    dr2/dr1=0 ⇔ r1→∞ (2)

    From (1) and (2) ⇔ r2=1/[4*∏*ε*Ec/(Z1*Z2*e2)]

    Now the problem is that in the book the correct answer is half of mine. Can someone help me to understand why?
  2. jcsd
  3. Jul 17, 2014 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted