If an electron has the same de Broglie wavelength as the wavelength of a 390-nm photon in vacuum, what is the speed of the electron?
(melectron = 9.11 × 10-31 kg, c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 1,900 m/s
B) 2,100 m/s
C) 1,700m/s
D) 1,500 m/s
E) 540 m/s
A
Physics & Space Science
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