A Crystal Is Irradiated with X-Rays with a Wavelength Of 0.120

question 132

Multiple Choice

A crystal is irradiated with x-rays with a wavelength of $0.120 \mathrm {~nm}$ . The atomic planes in the crystal are separated by $0.21 \mathrm {~nm}$ . At what angles of incidence with respect to the normal will the $x$ -rays reflect from the crystal?

• A) only \(73 ^ { \circ }\)
• B) only \(55 ^ { \circ }\)
• C) \(73 ^ { \circ } , 55 ^ { \circ } , 31 ^ { \circ }\)
• D) only \(73 ^ { \circ }\) and \(31 ^ { \circ }\)

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Free Blacks

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The radical 19th-century movement demanding the immediate end to slavery without compensation to slave owners or gradual emancipation.