1. Earth’s atmospheric radio window allows frequencies of about _______ to _________ to pass through.
2. When a continuous spectrum is viewed through a cool gas, dark _____________ _________________ appear in the spectrum.
3. Each spectral line corresponds to one particular ______________ between energy states of particular atoms or molecules.
4. The method of identifying molecules in atmospheres by observing their absorption lines is called _______________ _______________.
5. _______________ lines occur when oppositely charged ions recombine to a neutral, yet highly excited state.
1. 5 MHz, 300 GHz 2. absorption lines 3. transition 4. molecular spectroscopy 5. Recombina-tion
|