Higher in pitch as the fire engine approaches, due to the compression of sound waves. The siren will then sound lower in pitch as the fire engine moves away, causing the sound waves to stretch out.
A fire makes a crackling sound when it burns.
Fire engines are equipped with loud sirens to alert other drivers and pedestrians of their presence and to quickly clear the way for the emergency vehicle to pass through traffic. The loud sound helps to grab people's attention and allow the fire engine to navigate through traffic safely and swiftly.
Yes!
The Doppler effect.
No
The sound of fire crackling and popping is a combination of sharp snaps and crackling noises.
1518
Fire has no sound.
because the engine is starting to run.
You can hear a fire engine coming around the corner before you can see it because the sound waves can travel faster than the vehicle itself. The siren on a fire engine emits a loud, high-pitched noise that can be heard from a distance, alerting you to its presence before it comes into view.
If you are hearing a loud popping sound from your carburetor while the engine is running, then that is engine back fire. It is possible that your timing is off at the distributor if it happens often.