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Question
What is the speed of a proton having de Broglie wavelength of 0.08 Å?
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Solution
Data: λ = 0.08 Å = 8 × 10-12 m, h = 6.63 × 10-34 J.s, m = 1.672 × 10-27 kg
λ = `"h"/"mv"`
∴ v= `"h"/"mλ"`
v = `(6.63xx10^-34)/((8 xx 10^-12)(1.672 xx 10^-27))`
v = 4.957 × 104 m/s
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