How will our voices on alien worlds be different compared to those on Earth? First of all, there is no doubt that we have no time to chat without equipment. For example, on Mars , if we don't wear spacesuits and then come to talk outdoors, we will die from blood boiling before we finish a sentence. But there seems to be still time for everyone to say "hello" to each other, so what does this "hello" sound like?
Our sound production process
Let us first take a look at where our voices come from and why they sound like this.
Human voice comes from this: people exhale the air in their lungs, this air passes through the vocal cords, and then causes the vocal cords to vibrate, producing sound waves. When this sound wave passes through the vocal tract, it changes slightly and is then output outward, causing the air molecules to vibrate rhythmically, allowing the sound wave to propagate outward and be heard by other people.
The characteristics of sound, including human voice, are determined by its sounding material, amplitude and frequency. The sound-producing material determines the timbre of the sound. Taking the human voice as an example, each person's vocal cords are unique, which makes each person's voice unique. The greater the amplitude of the sound, the greater the loudness. In other words, the louder the sound sounds. Frequency determines the pitch of the sound. The lower the frequency, the lower the pitch; the higher the frequency, the higher the pitch. In layman's terms, the lower the frequency, the deeper the sound; the higher the frequency, the "shriller" the sound. Moreover, the frequency of sound is closely related to the wavelength of sound: the longer the wavelength, the lower the frequency.
In an alien world, our vocal organs will still not change, but the air composition will be very different from that on Earth. Then during the propagation process of our sounds, the amplitude and frequency will be changed, causing our sounds to "sound" very different from those on Earth.
Sounds on Earth
Because humans are life on earth, almost all human organs have evolved to adapt to the earth’s environment. Therefore, the earth’s atmospheric environment is the most suitable for humans. In terms of atmospheric density, the density of the earth’s atmosphere is just right for humans.
The main components of the earth's atmosphere are composed of 78% nitrogen , 21% oxygen and other gases. During the propagation of sound, these atmospheric molecules do not absorb too many sound waves, so our sounds on Earth sound clearer and travel farther.
Trembling faintly on Mars
On this red planet, if a person greets you, his voice will be very small. Although his timbre has not changed much, you have to work hard to hear him. This is because the atmospheric pressure of Mars is only 0.6% of that of the Earth. According to the speed of sound formula, when the atmospheric density is almost the same, the lower the pressure, the lower the speed of sound.
Moreover, 95% of the composition of the Martian atmosphere is carbon dioxide . Compared with nitrogen and oxygen molecules, carbon dioxide molecules absorb sound waves more easily, so under such conditions, sound cannot travel far. Even if that person shouts "Hello" at the top of his lungs, his voice can hardly reach more than 9 meters away. In addition, the average temperature on the surface of Mars is only -52°C, so his greeting voice will still have "a hint" of trembling.
is mesmerizing on Titan
Titan is the satellite of Saturn , and its other name is Titan . According to scientists' current findings, its atmospheric composition is most similar to that of the Earth. The atmospheric composition is 97% nitrogen, about 2.7% methane, and other gases. In addition, its atmospheric density is 50% greater than that of the Earth.
According to the speed of sound formula, we can know that if the air pressure remains unchanged, the greater the density of the atmosphere, the slower the speed of sound. In addition, high-density nitrogen air will also reduce the frequency of our voices, making our voices deeper. As a result, our voices on Titan have a different, deeper quality. And, as we said above, nitrogen doesn't absorb too many sound waves, so our deep, mesmerizing sounds travel quite a distance.
Husky and low sound on Venus
The density of Venus' atmosphere is about 93 times that of the Earth, and its atmospheric pressure is about 91 times that of the Earth. Through simple calculations, we can know that the speed of sound will become very slow on Venus. In addition, 96.5% of the atmosphere of Venus is carbon dioxide and 3.5% nitrogen. Under such conditions, the pitch of our voices becomes hoarse and low, and the volume becomes very small.
If we put our ear close to the speaker's mouth, then his voice sounds like the voice of Donald Duck in the original English version of Disney.
"Sounds" on other planets
Other planets are silent. Because they are so vacuum, or the air is so thin that it can be ignored, these planets have no air molecules to help propagate sound waves. On these planets, even if two people had a full mouthful of oxygen and said "hello" face to face, they would not be able to hear each other's greeting.
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