1.

Ka wavelength emitted by an atom of atomic number Z = 11 is l. Find the atomic number for an atom that emits Ka radiation with wavelength 4l            [IIT-JEE (Screening) 2005]

A.            Z = 6                                         
B.            Z = 4
C.            Z = 11                                      
D.            Z = 44
Answer» B.            Z = 4


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