Certain Planes of a Crystal of Halite Have a Spacing

question 32

Multiple Choice

Certain planes of a crystal of halite have a spacing of 0.399 nm.The crystal is irradiated by a beam of x-rays.First order constructive interference occurs when the beam makes an angle of 20° with the planes of the crystal surface.What is the wavelength of the x-rays?

• A)0.14 nm
• B)0.17 nm
• C)0.21 nm
• D)0.24 nm
• E)0.27 nm

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