Practice question
Question
A proton has a de Broglie wavelength of 2.0 × 10⁻¹² m. What is its kinetic energy? (h = 6.626 × 10⁻³⁴ J s, mₚ = 1.67 × 10⁻²⁷ kg)
Explanation
v = h/(mλ). KE = ½mv² = 3.29×10⁻¹⁷ J.
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