(a) Find the potential difference ?Ve required to stop an electron (called a \"s

Question

(a) Find the potential difference ?Ve required to stop an electron (called a "stopping potential") moving with an initial speed of 2.82 107 m/s.
___________________ kV

(b) Would a proton traveling at the same speed require a greater or lesser magnitude potential difference? Explain.


(c) Find a symbolic expression for the ratio of the proton stopping potential and the electron stopping potential, ?Vp/?Ve. The answer should be in terms of the proton mass mp and electron mass me.
?Vp
?Ve
= ______________

Explanation / Answer

Part c for u again........ c)We have ?Ve=-0.5*me*v*v/e Similary as we found out for electron for proton we have ?Vp=0.5*mp*v*v/e Hence (if we take ratios) ?Vp /?Ve = -mp/me [negative sign represents that the potential applied for a electrona and that for an proton for same direction movement will have just opposite polarity to each other] [this will be valid only if you have same initial velocity for both

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