Find the electric potential difference Delta V_e required to stop an electron (c

Question

Find the electric potential difference Delta V_e required to stop an electron (called a "stopping potential") moving with an initial speed of 2.70 times 10^7 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. (c) Find a symbolic expression for the ratio of the proton stopping potential and the electron stopping potential, Delta V_p/Delta V_e. Use the following as necessary: m_p for the mass of proton and m_e for the mass of electron.) Delta V_p/Delta V_e =

Explanation / Answer

A) stopping potential = KE/q

= 0.5*9.1e-31*2.7e7^2 /1.6e-19

= 2073 V

= 2.073 kV

B) Greater, because is KE will be greater due to its large mass.

C) Vp/Ve = (0.5 *mp*v^2) /(0.5 me*v^2)

= mp/me

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