Practice question
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)
Explanation
v = √(2KE/m) ≈ 3.096×10⁶ m s⁻¹.
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