What is the speed of the proton?

  • Thread starter yy205001
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  • #1
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what is the speed of the proton??

Homework Statement


What is the speed of a proton after being accelerated from rest through a 50x106 potential difference?

m_proton = 1.67x10-27kg
C = 1.6x10-19 c
* This question is in Relativity.

Homework Equations


Voltage(v) = Joule(j)/Columb(c)
K = 1/2(mu2)


The Attempt at a Solution


Firstly, i timed 1.6x10-19 to 50x106 to find the Energy(j
). Then plugged into the kinetic energy formula to find u(speed_proton). But which is wrong. what is the mistake?
 
Last edited:

Answers and Replies

  • #2
1,225
75


Hi. It seems OK to me. How did you judge you are wrong?
By the way
m_proton = 1.67x106kg is too heavy! -6?, not sure. You should check it in some physics table.
 
  • #3
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it should be -27. I was doing a online HW. when i typed in the answer, the system said that it was wrong.
 
  • #4
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Does proton carry the same charge as electron??(c=1.6x10^-19)
 
  • #5
350
1


If you use KE equation you get a speed of about 1x10^8 m/s.....this is a bit too close to the speed of light and you may need to use relativity equation.
 
  • #6
tms
644
17


* This question is in Relativity.

Homework Equations



K = 1/2(mu2)
If the speed is relativistic, then that is not the correct equation for kinetic energy.
 

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