radio or microwave telescopes
Since the difference in energy between the different rotational states a molecule is very small, many molecular lines can be observed with
a red emission line
In a hydrogen atom, a transition from the third to the second energy level will produce
This is an example of the Doppler Effect
The observed spectral lines of a star are all shifted towards the red end of the spectrum. Which statement is true?
Molecules can vibrate and rotate as well
Why are molecular lines more complex than elemental spectral lines?
a few bright lines against a dark background
The Orion Nebula, M-42, is a hot, thin cloud of glowing gas, so its spectrum is
The energy required to ionize a hydrogen atom whose electron is in the ground state (energy level1) is
chemical composition, whether it has a strong magnetic field, its radial motion, its temperature
What information about an astronomical object can be determined by observing its spectrum?
absorption lines due to the thin outer layer above the photosphere
The Fraunhofer lines in the solar spectrum are actually
density of the hot medium, magnetic fields of the star, rotation of the star, thermal motion of the hot atoms
The broadening of spectral lines can be caused by