Question

Questions for my lab:

What is the significance of the observation of discrete spectral lines in the emission spectrum of hydrogen?

What is the possible effects due to the adjustment of the spectrometer in a hydrogen spectrum?

What is the possible effects due to the orientation of the grating in a hydrogen spectrum? Thanks

Answer 1

1) Significance of the observation of discrete spectral line in emission spectrum of hydrogen are following-

     a) One can understand how discrete spectra actually look like.

     b)With the help of diffraction grating spectrometer, one can calculate the wavelength of these spectral line that matches with different spectral lines series like Balmer,etc and study the structure of hydrogen atom hence these discrete spectral line proves the Bohr theory of atom.

   c) Once wavelength of each spectral line is known, one can find from which orbit electron is jumping that result in following color of spectral line and hence one can find energy the orbits through the Rydberg's formula.

2) By the adjustment of spectrometer, the spectral lines can be made more narrow and focussed so that reading can be more accurate.

3) If parallel light of wavelength falls on the diffraction grating, then the angle at which the intensity of transmitted light is maximum is given by

                               d sin() = n                          where n is any integer and d is the spacing of slit in grating

by adjusting the orientation of grating ,the precise measurement of angle can be done. Hence wavelength can be calculated very accurately.