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The wavelength of the first Balmer line of hydrogen is 656 nm. The wavelength of the corresponding line for a hydrogenic atom with Z=6

The wavelength of the first Balmer line of hydrogen is 656 nm. The wavelength of the corresponding line for a hydrogenic atom with Z=6 and nuclear mass of 19.9210 kg is (a) 18.2mm (d) 393.6mm (b) 109.3nm (c) 143.5mm

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