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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

4

B

5

C

6

D

7

Text Solution

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The correct Answer is:
B
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