Calculate the wavelength of radiation which excites the electrons of hydrogen atom from ground state to fourth energy level.ionization energy of hydrogen is 1312kj/mol
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energy of ground state is 13.6ev and energy of fouth energy level is 0.85
energy require for excitation = 13.6-0.85=12.75ev
wavelength=1240/12.75 = 97.25nm
wavelength = 97.25
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