Identifying Isotopes by Spectra Different isotopes of the same element emit light at slightly different wavelengths. A wavelength in the emission spectrum of a hydrogen atom is 656.45 nm; for deuterium, the corresponding wavelength is 656.27 nm.
(a) What minimum number of slits is required to resolve these two wavelengths in second order?
(b) If the grating bas 500.00 slits/mm. find the angles and angular separation of these two wavelengths in the second order.