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A 0.12 kg ball moves at 20 m/s. Its de Broglie wavelength is about what?
A5.52 × 10⁻³⁴ m
B1.38 × 10⁻³⁴ m
C2.76 × 10⁻³⁴ m
D2.76 × 10⁻³² m
Answer & Solution
Correct answer: C. 2.76 × 10⁻³⁴ m
p = 0.12 × 20 = 2.40 kg m/s and λ = 6.63 × 10⁻³⁴/2.40 = 2.76 × 10⁻³⁴ m.
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