Determine the ratio of the electron's speed

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SUMMARY

The discussion focuses on determining the ratio of the electron's speed to that of the proton at the end of their trajectories, given a kinetic energy of 5.29 keV. Participants confirm that the correct approach involves calculating the velocities of the electron and proton separately using their respective kinetic energies and then dividing the results to find the ratio. The derived formula is v/u = sqrt(M/m), where M is the proton mass and m is the electron mass, resulting in a speed ratio of approximately 42.85, valid under the condition that v is much less than the speed of light (c).

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lovelylm1980
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Determine the ratio of the electron's speed over that of the proton at the end of their respective trajectories? KE = 5.29keV

My question is do I use the kinetic energy to get velocity of electron then proton separately, and afterwards divide the results to obtain the ratio?
 
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That's what I would do.
 
electron: m, v
proton: M, u

mv²/2 = Mu²/2
mv² = Mu²
v²/u² = M/m
v/u = sqrt(M/m) = sqrt(1836) = 42.85

(valid for v << c)
 

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