(a) Find the potential difference AV, required to stop an electron (called a "stopping potential") moving with an initial speed of 2.85 X|107 m/s. (b) Would a proton travel- ing 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, AV,/AV,. The answer should be in terms of the proton mass m, and electron mass m.

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A:

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