A Beam of X-Rays of Different Frequencies Is Reflected at 10

question 24

Multiple Choice

A beam of X-rays of different frequencies is reflected at 10 degrees off a crystal of interatomic spacing 0.2 nm.Which X-ray wavelength is preferentially reflected?

• A)0.0943 nm
• B)0.139 nm
• C)0.069 5 nm
• D)1.02 * 10-10 m
• E)3.47 * 10-11 m

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A Swiss psychologist renowned for his developmental stage theory that children progress through four critical stages of cognitive development.

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