The kinetic energy of an electron of mass 9.1 × 10⁻³¹ kg moving at 1 × 10⁶ m/s is approximately:
A1.82 × 10⁻¹⁸ J
B4.55 × 10⁻¹⁷ J
C9.1 × 10⁻²⁵ J
D4.55 × 10⁻¹⁹ J
Answer & Solution
Correct answer: D. 4.55 × 10⁻¹⁹ J
K = ½·9.1×10⁻³¹·(10⁶)² = 4.55 × 10⁻¹⁹ J.
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