(a) Find the electric potential difference AVe required to stop an electron (cal
ID: 1656300 • Letter: #
Question
(a) Find the electric potential difference AVe required to stop an electron (called a stopping potential") moving with an initial speed of 2.30 x 107 m/s kV (b) Would a proton traveling at the same speed require a greater or lesser magnitude of electric potential difference? greater lesser equal Explain. This answer has not been graded yet. (c) Find a symbolic expression for the ratio of the proton stopping potential and the electron stopping potential, AVp/AVe. (Use the following as necessary: mp for the mass of proton and me for the mass of electron.)Explanation / Answer
1] Potential difference = work/charge = KE/charge = 0.5mv^2 /q
= 0.5*(9.1e-31)*(2.3e7)^2/(1.6e-19)
= 1504 V
= 1.504 kV answer
Explain: Proton's case require greater potential difference because due to its greater mass, its initial kinetic energy is more, so higher potential is required to overcome that huge KE.
2] Vp/Ve = [0.5mpv^2/q] /[0.5mev^2/q]
= mp/me answer
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