What kind of weather does the sound of an airplane travel far?

The sound of airplanes is indeed different. At the same distance, sometimes the sound is loud and sometimes the sound is quieter

Let me analyze it from a scientific perspective:

Sound waves are small disturbance waves that propagate outward in the form of alternating density and density changes in the air. The sound heard by the human ear is in the range of 20 to 20,000 Hz. It belongs to very low frequency and ultra-long wave.

The lower the frequency and the longer the wavelength, the smaller the ground loss and the stronger the diffraction capability.

The smaller the ground conductivity, the greater the ground loss. So sound can travel farther on the water.

The speed of sound propagation is related to the compressibility of air. In the same medium, the speed of sound only changes with the temperature of the medium. When the temperature is high, the speed of sound is high; when the temperature is low, the speed of sound is low. In addition, as altitude increases, the temperature of the atmosphere decreases, and the speed of sound decreases.

High air humidity and high water vapor content will make the air less dense. The higher the temperature, the greater the maximum amount of water vapor the air can contain. As the temperature decreases, the relative humidity increases.

The clouds on cloudy days are thicker than those on sunny days, and because the air on cloudy days is humid and contains a lot of water vapor, and because sound propagates faster in water vapor, less sound is absorbed by the clouds. On sunny days, when the clouds are thin and the air is dry, most sounds can reflect sound waves when they encounter soft things like clouds, thus producing echoes. And clouds can reflect upward-propagating noise back to the ground.

So the sound heard on cloudy days is faster and smaller. And the sound heard on a sunny day is loud.

In addition, sound has three characteristics: pitch, loudness, and timbre.

The loudness is affected by many aspects, mainly 1. the distance from the sound source 2. the vibration amplitude of the object...including wind speed. Because wind is flowing air, and air is the medium through which sound propagates.

So wind also affects the propagation of sound and affects the "loudness" characteristics. A tailwind makes the sound travel farther, while a headwind does the opposite.

To sum up, it can be concluded from the above analysis that the sound is louder and can travel farther on cloudy days and downwind weather.

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