`k_(a) ` wavelength emitted by an atom of atomic number `Z= 11` is `lambda` find the atomic number for an atom that emils `k_(a)

`k_(a) ` wavelength emitted by an atom of atomic number `Z= 11` is `lambda` find the atomic number for an atom that emils `k_(a)` radiation with wavelength `4 lambda`.
A. `Z=6`
B. `Z=4`
C. `Z=11`
D. `Z=44`

`k_(a) ` wavelength emitted by an atom of atomic number `Z= 11` is `lambda` find the atomic number for an atom that emils `k_(a)` radiation with wavel

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