Certain Planes of a Crystal of Halite Have a Spacing $0.399 \mathrm {~nm}$

question 64

Multiple Choice

Certain planes of a crystal of halite have a spacing of $0.399 \mathrm {~nm}$ . The crystal is irradiated by a beam of $x$ -rays. First order constructive interference occurs when the beam makes an angle of $20 ^ { \circ }$ with the planes of the crystal surface. What is the wavelength of the $x$ -rays?

• A) \(0.27 \mathrm {~nm}\)
• B) \(0.21 \mathrm {~nm}\)
• C) \(0.24 \mathrm {~nm}\)
• D) \(0.14 \mathrm {~nm}\)
• E) \(0.17 \mathrm {~nm}\)

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