Matter Waves: An electron is moving with the speed of 1780 m/s. What is its de Broglie wavelength? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)
A. 409 nm
B. 302 nm
C. 205 nm
D. 420 nm
E. 502 nm
Answer: A
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