Practice question

Practice question

The kinetic energy of an electron in the first orbit of He⁺ is 4.36 × 10⁻¹⁸ J. What is its velocity? (mₑ = 9.1 × 10⁻³¹ kg)

Choose one · Correct answer highlighted

2.19 × 10⁶ m s⁻¹ 4.38 × 10⁶ m s⁻¹ 3.096 × 10⁶ m s⁻¹ Correct 1.548 × 10⁶ m s⁻¹

v = √(2KE/m) ≈ 3.096×10⁶ m s⁻¹.

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