An electron of mass 9.11x10−31kg has 8.00x10−17J of kinetic energy. What is the speed of the electron?
Physics
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Question
An electron of mass 9.11x10−31kg has 8.00x10−17J of kinetic energy. What is the speed of the electron?
1 Answer

1. User Answers KizunaHigh
Calculating the Speed with Kinetic Energy.
Given
 Mass (m) = 9.11 x 10⁻³¹ kg
 Kinetic Energy (KE) = 8.00 x 10⁻¹⁷ J
 Speed (v) = ?
v² = KE / 1/2m
v² = (8.00 x 10⁻¹⁷ J) / (1/2)(9.11 x 10⁻³¹ kg)
v² = (8.00 x 10⁻¹⁷ J) / (4.56 x 10⁻³¹ kg)
v² = 1.75 x 10⁴⁸ m/s
√v² = √1.75 x 10⁴⁸ m/s
v = 1.32 x 10²⁴ m/s
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