Planck's constant is 6.6 x 10-34 J·s and the proton mass is 1.7 x 10-27 kg....

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Planck's constant is 6.6 x 10^-34 J·s and the proton mass is 1.7 x 10^-27 kg. The speed of a proton whose de Broglie wavelength is 4.0 x 10⁷ m is

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