Quantum theory — Question 93
Original QCE Vault practice · 3 marks
Q93 · Practice questionSimple familiar3 marks
QUESTION 93 (3 marks)
A proton moves at 4.0×105m s−1. Determine its de Broglie wavelength. WORKED SOLUTION
Practice marking scheme
3 marksANSWERλ=9.92×10−13m. Worked solution
λ=ph=mvh=(1.67×10−27)(4.0×105)6.626×10−34=9.92×10−13m. Uses de Broglie relationship.
Calculates momentum or substitutes mv.
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