That s the way sound waves transmit energy! Vacuum? Water?

There is no energy dissipation when the sound wave propagates and the amplitude remains the same when the planar sound wave propagates in an ideal medium.

But the actual situation is more complicated in most cases. In Sui conditions, the amplitude of the sound wave decreases as it propagates.

There are a variety of reasons for the amplitude of sound waves to decrease during propagation.

One is the diffusion of sound waves, usually the sound waves emitted by the sound source propagate in all directions, expanding into larger and larger spaces, so the energy density of the sound field gradually decreases.

Another reason is the scattering of sound waves, when the sound waves travel and encounter obstacles in different media, a part of the sound waves will change the direction of propagation, taking away the energy.

Obstacles can be relatively large or relatively small, such as tiny particles suspended in the medium, and the inhomogeneity of the medium will also produce scattering, and the sound attenuation caused by scattering.

Another important reason is that part of the energy of sound waves is absorbed by the medium through different mechanisms and converted into other forms of energy, which is generally eventually converted into heat energy.

This phenomenon is called the absorption or attenuation of sound waves, and the sound attenuation is not very large in common media such as air and water, and can be ignored in some practical problems.

However, when the distance of sound propagation is relatively large, or the sound absorption of the medium is relatively strong, and the absorption of sound waves must be considered in some more precise measurement problems.

The absorption of sound waves is a difficult problem, and there are several different absorption mechanisms, involving the microstructure and movement of the medium.

There are a lot of contents in this area, some of which are not very complete and systematic, this chapter has made some basic introductions to the absorption of sound waves, if there are other problems, Pan Fa Huayi ultrasonic ** at your service.

Pan Fa Huayi Ultrasonic specializes in the research and development of ultrasonic plastic welding machines, hot press welding machines, hot plate welding machines, rotary positioning welding machines, high-frequency and other machines.

The meaning of true omen-return to space refers to the state of gas with a pressure below one atmosphere in a given space, which is a physical phenomenon.

A medium is required for the propagation of sound, there is no medium in a vacuum, sound is a mechanical wave, and a mechanical wave is produced due to the vibration of an object. The propagation of mechanical waves depends on the medium, such as: air, water, etc.

And there is no medium in the vacuum, that is, there are no objects such as air, water, etc.

Light is a particle wave and an electromagnetic wave, not a mechanical wave, and it can propagate in both a transparent medium and a vacuum.

Sound waves are produced by the vibration of a sound source in the air, and sound waves can transmit energy. Sound waves can cause other objects to vibrate, indicating that sound waves have energy.

1. The propagation of vibrations produced by the sound emitter in the air or other substances is called sound waves. Sound waves travel in all directions with the help of various mediums. Sound waves are usually longitudinal waves, but also transverse waves, where the sound wave goes the point vibrates near the equilibrium position along the direction of propagation, and the propagation of the sound wave is essentially the transfer of energy in the medium.

2. Sound waves are the propagation form of sound, and the object that emits sound is called the sound source. Sound waves are mechanical waves that are generated by the vibration of a sound source, and the space in which the sound waves travel is called the sound field. The frequency of sound waves that can be heard by the human ear is generally between 20 Hz (Hertz) and 20 kHz.

3. Sound waves can be understood as the propagation of small perturbations in a medium that deviates from equilibrium. This propagation process is only the transfer of energy and does not take place the transfer of mass. If the perturbation is relatively small, the propagation of the sound wave satisfies the classical wave equation and is a linear wave.

If the disturbance is large, the linear acoustic wave equation is not satisfied, and the dispersion of the wave and the generation of shock waves will occur.

Fourth, sound begins with the vibration of air particles, such as those produced by guitar strings, human vocal cords, or speaker paper cones. Together, these vibrations push neighboring air molecules while slightly increasing the air pressure. The air molecules under pressure then push the surrounding air molecules, which in turn push the next group of molecules, and so on.

When a high-pressure area passes through the air, it leaves a low-pressure area behind. When these pressure wave changes reach the human ear, they vibrate the nerve endings in the ear, and we hear these vibrations as sounds.

When I read this sentence, I felt a little funny, although the sound cannot be transmitted in the vacuum, this is mainly because the transmission of sound requires a medium, and in the vacuum because the medium is particularly scarce, and the temperature in the vacuum is very low, all the medium is in a dormant state, so there is no way to transmit our sound, but this does not mean that the energy needs to be transmitted through the medium. The reason why many people think that energy cannot be transmitted in a vacuum is mainly because they feel that space is cold and silent, which means that there is no way for energy to pass through space, but in fact, the reason why space is so calm is mainly because there is too little medium to store and disperse energy. <>

After all, you must know that the sunlight we receive on the earth every day is through a long distance to our earth, and this journey is actually in a vacuum, and the earth has to receive immeasurable solar energy every day, and these pesticides are used by us for production and life. The reason why the earth can store so much energy is that on the one hand, our earth has an atmosphere, and on the other hand, many animals and plants on the earth are purified according to the habits of sunlight, so as to transform these energies. <>

For example, any fruit we eat, in fact, is a manifestation of the transformation of sunlight energy, and the real sun, the energy is actually very high, if there is no atmosphere blocking, the sunlight directly irradiates our human body, which will cause very serious consequences, which will directly lead to damage to our organs. <>

And in addition to light and energy in space, there are many energy substances, such as gravitational waves that we can't see, in fact, they also have energy, and human exploration of the universe is still in its infancy, and we may find more ways to transfer energy in the future. So vacuum can't transmit sound, but it can transmit energy.

OK. There is no interaction in the vacuum, but there is the existence of energy growing separately, and it should be possible to feel the dynamics of transferring energy.

Vacuum can transfer energy, otherwise how would the energy from the sun reach the earth? Sound energy transmits energy, but energy is not always transmitted through sound, energy can also be transmitted through electromagnetic waves, which can be transmitted through vacuum.

Vacuum can't transmit sound, but it can transmit energy, such as our most common light.

OK. Light and various electromagnetic waves can travel in a vacuum. Another example is a gamma-ray burst, which can destroy the Earth in an instant, and can also spread in a vacuum.

It's just that sound propagation needs a medium.

First, affirm that sound waves can indeed transmit energy;

Ultrasonic ** is the best proof of this, and secondly, ultrasonic cleaning and the like are no longer a new topic.

To prove that sound waves transmit energy, you can try the following experiments:

You can find a tablet, put it directly above the speaker (the speaker is flat), and then put some small particles on this plate, such as foam crushed, rice grains, etc. (to be light), and then ****, you will observe that these small particles are beating, **What about the energy? Of course, it's the sound wave that comes from the pull!

Of course, there are many experiments that can prove this fact, you can imagine that there is a thunder around you, and sometimes the thunder will shake the glass with a bang, which is of course the energy of the sound waves.

Of course, the amount of energy transmitted by sound waves has a certain relationship with the frequency and loudness of the sound source.

We hope you are satisfied.

Sound waves are generated by the propagation of the energy of the vibration source to the surroundings, and the propagation of sound waves requires a medium and cannot be propagated in a vacuum

Assuming that the location of the satellite is completely vacuum, then the vibration caused by its mechanical friction cannot be propagated, that is, the sound of its friction cannot be heard from a certain distance, and the energy generated by the friction will remain in the satellite in the form of internal energy, which will increase the temperature of the satellite

But the temperature of the satellite will not rise all the time, because the satellite will emit infrared short waves into the vacuum and transmit energy, which you can't see If you have studied high school physics, it is said that the earth will emit infrared short waves outward, so in autumn, the temperature is higher in the morning on cloudy days, and the temperature is very low in the morning without clouds

You can often see the extreme situation of infrared waves emitted by objects in your life, such as a piece of iron, when it burns to a red-hot state, your hand can feel the heat at a relatively long distance from it

Because the transmission of sound waves requires a medium, and there is no matter in the vacuum, sound waves cannot propagate in a vacuum.

Light waves can propagate without a medium, whereas sound waves require a medium and can propagate in a medium other than air, and there is no medium in a vacuum so it cannot propagate.

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