A family of planes of spacing 0.2518 nm of NaCI crystal reflects a bea – McqOptions

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1.	A family of planes of spacing 0.2518 nm of NaCI crystal reflects a beam of X-ray in first order at an angle of 30°. The wavelength of X-rays is:
A.	0.2518 nm
B.	0.1259 nm
C.	0.3778 nm
D.	0.5036 nm
Answer» B. 0.1259 nm

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