Question

An electron with an initial speed of 580,000 m/s is brought to rest by an electric field. Did the electron move into a region of higher potential or lower potential? A)Because the electron is a negative charge and it slows down as it travels, it must be moving from a region of higher potential to a region of lower potential. B) Because the electron is a negative charge and it slows down as it travels, it must be moving from a region of lower potential to a region of higher potential. C) Because the electron is a positive charge and it accelerates as it travels, it must be moving from a region of lower potential to a region of higher potential. D) Because the electron is a positive charge and it accelerates as it travels, it must be moving from a region of higher potential to a region of lower potential.

What was the potential difference that stopped the electron?

What was the initial kinetic energy of the electron, in electron volts?

Answer 1

A) Since the electron is negatively charged, it must be moving from higher potential region to a lower potential region, because it is slowing down and will eventually stop Potential difference (9.1x10-31)(0)2_1( 9.1x10-31)(580000)-(-1.6×10-19) V V= 0.9566375 V V 0.96 V Initial kinetic energy, (0.511 MeV) 580000 m/s 300000000 m/s (0.511 eV) (10) (3.7377x10) 0.955 eV