To be more specific, a sound source moving toward you will appear to emit a sound of higher frequency than actual. Conversely, a sound source moving away from you will appear to emit a sound of lower frequency than actual. See "the Doppler effect."
The range of frequency of sound that coal trains emit when moving hovers around 20 Hz to 20,000 Hz
To emit something, a sound, smell or aura.
Whales (but also the humble toadfish) emit low-pitched sounds that can carry extremely far under water. The speakers of professional sound systems used by bands and DJ's also have a lot of bass. Diesel engines when stationary emit a very low-frequency sound. On a bigger scale, earthquakes, avalanches and volcanic eruptions create a very low piched noise.
Sounds are vibrations carried through a solid, liquid, or gas. The Eardrum picks up these vibrations, which vibrate the Eardrum, and send the signal through the auditory nerve where the brain deciphers the signal.
To be more specific, a sound source moving toward you will appear to emit a sound of higher frequency than actual. Conversely, a sound source moving away from you will appear to emit a sound of lower frequency than actual. See "the Doppler effect."
They do not
That is 'emit'
Sometimes they emit a sound ike 'Brrrawk', and sometimes they emit a sound like 'Screee...', so there are many possibilities available to the Falcon.
Generally. no.
Emit
The range of frequency of sound that coal trains emit when moving hovers around 20 Hz to 20,000 Hz
No
To emit something, a sound, smell or aura.
To emit heat
Loud animals are animals that emit a loud sound.
They emit a sound that bounces off surroundings and makes it's way back to the bat. It can then navigate itself around trees, other animals, and etc.