Question Detail
Question
What is the kinetic energy in eV of an electron with speed 4×10⁶m/s?
Correct Answer
Option D is the correct answer.
Detailed Explanation
Using KE = ½mv² with the electron's mass and given speed, then converting joules to eV by dividing by 1.6×10⁻¹⁹, gives approximately 4.60 eV.
Hint
Compute KE = ½mv² in joules first, then convert to electron-volts.