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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Definitions:

Powhatan Confederacy

A coalition of Native American tribes in the Eastern Woodlands that was dominated by the Powhatan people, during the early 17th century.

English Colonists

Individuals from England who settled in areas of North America, eventually leading to the establishment of early American colonies in the 16th and 17th centuries.

Jamestown

The initial enduring settlement by the English in North America, founded in Virginia during the year 1607.

Headright System

A land grant policy that was used during the colonization of America, offering settlers a certain amount of land for each individual they brought over to the New World.