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The wavelength of characteristic ${\mathrm{K}}_{\alpha }$-line emitted by an element is $2.5\mathring{\mathrm{A}}$. Find the wavelength of the ${\mathrm{K}}_{\gamma }$-line emitted by the same element (in Å). [Assume the screening constant to be same as of ${\mathrm{K}}_{\alpha }$ ]