An Electron Has a Speed of 0

question 39

Multiple Choice

An electron has a speed of 0.643c. Through what potential difference would the electron need to be accelerated (starting from rest) in order to reach this speed? (c = 3.00 × 10⁸ m/s, e = 1.60 × 10^-19 C,
M_el = 9.11 × 10^-31 kg)

• A) 160 kV
• B) 130 kV
• C) 180 kV
• D) 200 kV

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