Matter Waves: Electrons emerge from an electron gun with a speed of 2.0 × 106 m/s and then pass through a double-slit apparatus. Interference fringes with spacing of 2.7 mm are detected on a screen far from the double slit. What would the fringe spacing be if the electrons were replaced by neutrons with the same speed? (h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg, mneutron = 1.675 × 10-27 kg)
A. 1.5 ?m
B. 4.9 m
C. 0.93 nm
D. 1.2 km
Answer: A
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