In the $x$-ray reflection $(n=1)$, the distance between two parallel planes of $NaCl$ is $280 \ pm$ and the diffraction angle is $5.2^{\circ}$. What is the wavelength of its light radiation? (Given: $\sin 5.2^{\circ} = 0.09$)
- A$0.504 \ \mathring{A}$
- B$5.04 \ \mathring{A}$
- C$50.4 \ \mathring{A}$
- D$504 \ \mathring{A}$
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