Practice question
Question
An electron in He⁺ has an angular momentum of 3.165 × 10⁻³⁴ J s. What is its kinetic energy? (h = 6.626 × 10⁻³⁴ J s, mₑ = 9.1 × 10⁻³¹ kg)
Explanation
n=3. v = 1.46×10⁶ m s⁻¹. KE ≈ 9.7×10⁻¹⁹ J.
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