An X-Ray Beam of Wavelength 3 *10^-11 M Is Incident

question 23

Multiple Choice

An x-ray beam of wavelength 3 *10^-11 m is incident on a calcite crystal of lattice spacing 0.3 nm.The smallest angle between crystal planes and the x-ray beam which will result in constructive interference is:

• A)2.9°
• B)5.7°
• C)12°
• D)23°
• E)none of these

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Definitions:

Sensory Information

Data obtained from the environment by sensory receptors, then transmitted to the brain for processing and response.

Superior Colliculi

Paired structures located on the dorsal aspect of the midbrain, involved in processing visual (and other sensory) information and coordinating eye movements.

Reflexively Duck

An automatic, quick response to move or lower the head to avoid a hazard or threat.

Reticular Formation

A complex network of nerve pathways within the brainstem involved in consciousness and the regulation of sleep-wake cycles.