Q 1216723679.     Find the atomic number `Z` of the element which has a `K_α` x-rays line of wavelength `1.8` Å. (Given, `R = 1.1 × 10^(-7) m^(-1), b = 1` and `sqrt(5//33) = 0.39`)

A

`29`

B

`27`

C

`16`

D

`8`

HINT

`1/(λ_α) = (3R)/4 (Z - 1)^2`
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