Certain Planes of a Crystal of Halite Have a Spacing

question 88

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 angle does the beam make with the crystal planes for second order constructive?

• A)37°
• B)40°
• C)43°
• D)46°
• E)49°

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