1.

The wavelength involved in the spectrum of deuterium ""_(1)^(2)D are slightly different from that of hydrogen spectrum because ………

Answer»

the size of the TWO nuclei are different
the nuclear FORCE are different in the two cases.
the masses of the two nuclei are different.
the attraction between the electron and the nucleus is different in the two cases.

Solution :Because of different in mass of both atoms, `R_("atom")=((R_(oo))/(m))/(1+(m)/(M_("atom")))` where `R_(oo)=1.09737xx10^(7)m^(-1)`
m=mass of electron
changing `m_("atom")` changes `R_("atom")`
Hence the FORMULA for the wavelength of lines of the spectrum `(1)/(lamda)=R_("atom")((1)/(m^(2))-(1)/(n^(2)))` varies SLIGHTLY according to this formula.


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