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Calculate De-Broglie wavelength of an electron moving with a speed of nearly 1/20th that of light

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SOLUTION: Velocity of proton v =3×108/20 = 1.5 × 107 m/s

Mass of an electron = 9.11 x 10-31 kg 

λ = h/mv = 6.63×10-34/[9.11x10- 31×1.5 × 107]

λ = 0.48×10-10m

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