Quiz due monday --Balmer Series

This is a take-home quiz that is due Monday (at the beginning of class):

Balmer Series Quiz, Due Monday March 9, 2009

In the emission and absorption spectra of a hydrogen atom gas, sharp lines are seen at the following wavelenghts: 656 nm, 486 nm, 434 nm and 410 nm.

1. Determine the light frequency (in Hz) corresponding to each of these wavelengths.

2. a) Sketch a spectroscopy set-up for an absorption spectrum, and then graph:
b) a reference spectrum, and c) an absorption spectrum (intensity vs frequency). Start your frequency axis at zero for both graphs. For the absorption spectrum there is a gas of cold atoms in the beam; for the reference spectrum there are no atoms in the beam and no sharp features.

3. Sketch a spectroscopy set-up for an emission spectrum, and graph an emission spectrum (intensity vs frequency) for the same four line sequence. For an emission spectrum the light source is a hot gas of H-atoms.

4. Using h= 4.14 x 10^-15 eV-sec, calculate the energy of a photon at each of these four frequencies in eV. eV (electron-Volts) is a energy unit which is good for atoms.)