Practice question
Question
The kinetic energy of an electron in the third orbit of Be³⁺ is 2.42 × 10⁻¹⁸ J. What is its velocity? (mₑ = 9.1 × 10⁻³¹ kg)
Explanation
v = √(2KE/m) ≈ 2.306×10⁶ m s⁻¹.
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