H-alpha emission
a car emits a specific type of sound as it drives by – its own vibration, let's say.
Technical definition
Emission of light at a wavelength of 656.3 nanometers resulting from electronic transitions in hydrogen atoms.
a car emits a specific type of sound as it drives by – its own vibration, let's say.
Emission of light at a wavelength of 656.3 nanometers resulting from electronic transitions in hydrogen atoms.