A Beam of X-Rays of Wavelength 0

question 20

Multiple Choice

A beam of x-rays of wavelength 0.20 nm is diffracted by a set of planes in a crystal whose separation is 3.1 *10^-8 cm. The smallest angle between the beam and the crystal planes for which a reflection occurs is:

• A) 0.70 rad
• B) 0.33 rad
• C) 0.033 rad
• D) 0.066 rad
• E) no such angle exists

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