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A beam of neutrons with a de Broglie wavelength of 0.249 nm diffracts from a crystal...

A beam of neutrons with a de Broglie wavelength of 0.249 nm diffracts from a crystal of table salt, which has an interionic spacing of 0.282 nm.

(a) What is the speed of the neutrons?
km/s
(b) What is the angle of the first interference maximum?
°

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