Certain Planes of a Crystal of Halite Have a Spacing

question 32

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 is the wavelength of the x-rays?

• A)0.14 nm
• B)0.17 nm
• C)0.21 nm
• D)0.24 nm
• E)0.27 nm

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Definitions:

Test-Retest Reliability

The consistency of measurements or scores when the same test is administered to the same participants under the same conditions at different times.

True Scores

Theoretical values that accurately reflect the actual attribute or ability measured, devoid of any measurement error or bias.

Observed Scores

The actual scores or data collected from research participants during a study.

Reliability Coefficients

Statistics that measure the consistency or stability of scores from a test or measurement tool over time.