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An element of atomic number 9 emits K(al...

An element of atomic number 9 emits `K_(alpha)` X-ray of wavelength `lamda`. Find the atomic number of the element which emits `K_(alpha)` X-ray of wavelength `4lamda`.

A

25

B

26

C

100

D

99

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PHYSICS GALAXY - ASHISH ARORA-X-RAYS-Numerical MCQs Single Options Correct
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