Practice question
Question
A proton and an electron have the same kinetic energy. What is the ratio of their de Broglie wavelengths? (mₚ = 1.67 × 10⁻²⁷ kg, mₑ = 9.1 × 10⁻³¹ kg)
Explanation
λₚ/λₑ = √(mₑ/mₚ) ≈ √(5.45×10⁻⁴) ≈ 0.0233.
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