Planck's Constant Is 6

question 33

Multiple Choice

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

• A)7.8 * 10^-20 m/s.
• B)9.9 * 10² m/s.
• C)1.9 * 10⁶ m/s.
• D)3.9 * 10⁶ m/s.

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