Iron (z=26) emits line of wavelength1.96 A0 . For an element of unknown atomic number the wavelength of line is 0.49 A0. The atomic number of the unknown element is
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Iron (z=26) emits line of wavelength1.96 A0 . For an element of unknown atomic number the wavelength of line is 0.49 A0. The atomic number of the unknown element is