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The wavelength of the first spectral line in the Balmer series of hydrogen atom is 6561 ˚ A . The wavelength of the second spectral line in the Balmer series of singly-ionized helium atom is 2430 ˚ A 1212 ˚ A 4687 ˚ A 1640 ˚ A be obtained by heating?
Sagot :
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