If X-ray of wavelength 100 Å is incident on an atom at an angle of – McqOptions

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1.	If X-ray of wavelength 100 Å is incident on an atom at an angle of 90°, then what should be the value of d for first-order sepctrum?
A.	30 Å
B.	40 Å
C.	50 Å
D.	60 Å
Answer» D. 60 Å

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