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# For a crystal, the angle of diffraction (20) is $90^{\circ}$ and the second order line has a $\underline d$ value of $2.28 A^{\circ}$.The wavelength (in $A ^{\circ}$) of \$X-rays used for Bragg's diffraction is

$\begin {array} {1 1} (1)\;1.14 & \quad (2)\;2.00 \\ (3)\;2.28 & \quad (4)\;4.00 \end {array}$