why there is no sound when eroplain fly at night?

Question

braj_4201

Answer 1

um, sound DOES travel at night, and that spelling is atrocious.

Answer 2

Many of the planes you hear are flying under visual flight rules rather than electronic flight instruments (a higher qualification). They don't usually fly at night and what is left flies much higher such as commercial aircraft. Engines generate the same amount of noise day or night but the sound dissipates per the inverse square root law greatly diminishing distant noise.

Answer 3

Federal regulations prohibit planes from flying at low altitudes over populated areas at night, since that would disrupt people sleeping. It's not that airplanes don't make sound at night, it's just that there are fewer airplanes flying around at night, and the ones you do see are flying too high up to hear.
The planes you do hear are usually landing or taking off. As you may have noticed, it's rare for an airplane to take off or land in the middle of the night.

Answer 4

You are mistaken. Airplanes (or aeroplanes) make the same sound at night that they do in the daytime. You may be observing from a different location.

Noise abatement regulations are the same, day and night; that is, it is not correct that "federal regulations" make a difference at night.

The other possibility is that, if you are in the area of an airport, the wind direction is often different at night from what it is by day; thus you are hearing airplanes taking off at noon but landing at night.

Answer 5

There is sound from planes. The flight patterns are made such that they do not fly over populated areas at that time. For instance you will find that most take-offs and landings are scheduled in the morning and in the early evening (late afternoon) (6-10 am and 3-7pm).

Answer 6

If a plane's flying over an unpopulated field, does it make a sound?

Answer 7

I think that the reason you don't hear them at night is because certain regulations in regards to night flights limit them to certain airspace to keep from distrubing people's sleep. I am currently checking to make sure of this info, but I am sure that at certain altitudes there is less noise heard at ground level, just as at certain altitudes you can see the contrails from their passage. I will do my utmost best to confirm my take on this as I have a call in to a friend of mine who is the director of our local airport! :D To add: yes it is confirmed that some flights do go by at higher altitudes, that also there are not as many flights scheduled at nighttime, and that sometimes different runways are used causing air traffic to be diverted a different direction away from certain neighborhoods

Answer 8

There is sound, it's just that the aircraft you see at night are higher up so the sound has to travel further. So you can't hear it cos its so far. (if you see vapour trails forming on a clear day, its the same.) You're more aware of the planes anti colision lights (the flashing light) at night because it contrasts more against the dark sky than the day.

Answer 9

there is sound when an aeroplane flies at night.

Answer 10

There is. I have heard airplanes at night many times.