The wavelength \[{{K}_{\alpha }}\] of X-rays for two metals 'A' and ?B – McqOptions

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1.	The wavelength \[{{K}_{\alpha }}\] of X-rays for two metals 'A' and ?B? are \[\frac{4}{1875R}\] and \[\frac{1}{675R}\] respectively, where 'R' is Rydberg constant. Find the number of elements lying between A and B according to their atomic numbers
A.	3
B.	1
C.	4
D.	5
Answer» D. 5

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