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Planck's Constant Is H = 6

Question 26

Multiple Choice

Planck's constant is h = 6.6 * 10^-34 Js and the electron mass is 9.1 * 10^-31 kg.The speed of an electron whose de Broglie wavelength is 10^-10 is

A) 6.6 * 10^-24 m/s.
B) 3.8 * 10³ m/s.
C) 7.3 * 10⁶ m/s.
D) 10¹⁰ m/s.

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