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The wavelength of K(alpha) line for an e...

The wavelength of `K_(alpha)` line for an element of atomic number `43 is lambda`. Then the wavelength of `K_(alpha)` line for an element of atomic number `29` is

A

`43/29 lambda`

B

`42/28 lambda`

C

`9/4 lambda`

D

`4/9 lambda`

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The correct Answer is:
D
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