De Broglie wavelength of He⁺ electron

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An electron in the second orbit of He⁺ has a velocity of 2.19 × 10⁶ m s⁻¹. What is its de Broglie wavelength? (h = 6.626 × 10⁻³⁴ J s, mₑ = 9.1 × 10⁻³¹ kg)

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3.325 × 10⁻¹⁰ m Correct 6.65 × 10⁻¹⁰ m 1.663 × 10⁻¹⁰ m 9.975 × 10⁻¹⁰ m

λ = h/(mv) ≈ 3.325×10⁻¹⁰ m.

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