How sound travels, how sound travels

The production of sound is due to the vibration of the object, and sound is the fluctuation produced by the vibration of the substance, which needs to be transmitted by the medium to be heard.

He also thought about using experiments that could not propagate sound in a vacuum to prove his claim, but he was unable to achieve his wish because the technology for creating a vacuum was not mature at the time. Later, the British physicist Boeel invented the extraction machine, which pumped the vessel into a vacuum and redid the experiment, thus confirming the concept proposed by Torricelli.

In 1827, scientists experimentally proved that sound can be transmitted in water, and at the same time measured the speed of sound propagation in water. The sound waves that propagate in the air are longitudinal waves, tuning forks that vibrate continuously, causing the surrounding air molecules to form a dense and continuous waveform. In longitudinal waves, the vibrating force of the molecules of the medium is parallel to the direction in which the wave is advancing.

This indicates that the sound is produced due to the vibration of the object.

The reason why the listener cannot hear the sound is because the sound is blocked in the process of propagation, and the student pinched the cotton thread to stop vibrating, and the object vibrated and the sound stopped.

The propagation of sound requires matter, which is called a medium in physics, and this medium can be air, water, or solid. In a vacuum, sound cannot travel. The speed at which sound travels in different mediums is also different.

Question 1: How does sound travel? Composition of sound:

The composition of sound is caused by the vibration of the air, so that the eardrum receives high and low audio, and transmits it through a straight line of energy.

The propagation process of sound:

I divide the propagation process of sound into three steps: the first step is from the sound source to the pinna, which is a monotonous process with no change in waveform. The second step is for the sound waves to pass through the pinna into the external auditory canal, which is not a monotonous process, and the sound wave waveform is affected.

This step is key to acoustic localization and is discussed in more detail below. The third step is when the sound waves pass through the ear canal to the eardrum, causing it to vibrate and make us hear, which is also a monotonous process.

There are many ways to transmit sound, such as human sounds, television, radio, object collisions, animal sounds, and so on.

The directivity of the sound is also the direction of the sound, which is not as good as the front, the rear, the left and right, the distance, the entry and exit, and what kind of friend.

Question 2: "How does sound spread" The propagation of sound requires a medium (liquid, solid, gas) so vacuum cannot transmit sound, Question 3: How does sound travel through **? 15 points ** is propagated by electromagnetic waves, and the sound is first recorded into an electrical signal and then propagated by **.

Question 4: How does sound travel? Composition of sound:

The composition of sound is caused by the vibration of the air, so that the eardrum receives high and low audio, and transmits it through a straight line of energy.

The propagation process of sound:

I divide the propagation process of sound into three steps: the first step is from the sound source to the pinna, which is a monotonous process with no change in waveform. The second step is for the sound waves to pass through the pinna into the external auditory canal, which is not a monotonous process, and the sound wave waveform is affected.

This step is key to acoustic localization and is discussed in more detail below. The third step is when the sound waves pass through the external auditory canal to the eardrum, causing it to vibrate and make us tremble to hear the sound, which is also a monotonous process.

There are many ways for sound to travel, such as human sounds, television, radio, object collisions, animal sounds, and so on.

The directivity of the sound is also the direction of the sound, which is not as good as the front, rear, left and right, far out, in and out, or whatever.

Question 5: "How does sound spread" The propagation of sound requires a medium (liquid, solid, gas) so vacuum cannot transmit sound, Question 6: How is sound produced, and what are its transmission media? To put it simply, sound is generally produced by the disturbance or vibration of the air, and there are many mediums of transmission, such as solids, liquids, and gases. A vacuum cannot transmit sound.

The order of the speed of sound propagation in an object is from high to low: solid, liquid, gas.

The speed of propagation of sound in different mediums is different, i.e. in general, it is fastest in solids, followed in liquids, and slowest in gases; And even in the same medium, the propagation speed is different at different temperatures.

There are three conditions for sound propagation: there is a sound source, there is a medium for sound propagation, and there is a normal human ear. Sound is a wave generated by the vibration of an object, which is a wave phenomenon that propagates through a medium and can be perceived by the auditory organs of humans or animals.

Ordinary sounds always contain a certain range of echoed frequencies of the hermit. The frequency range of sounds that can be heard by the human ear is between 20 and 20,000 hertz. Fluctuations above this range are called ultrasound, while those below this range are called infrasound.

Animals such as dogs and bats can hear sounds up to 160,000 hertz. Whales and elephants produce sounds with frequencies in the range of 15 to 35 Hz.

The propagation of sound is explained by quantum mechanics as the movement of atoms, which forms sound waves.

Sound is propagated by the movement of sound waves.

Sound waves (spatial propagation)The vibration of the sound source causes the surrounding air to oscillate, and that type of oscillation is called sound waves. Sound waves travel in all directions with the help of air. In the air of an open space, the propagation is like a soap bubble that gradually blows up, a spherical array wave.

Sound refers to the special case of audible sound waves, such as the audible sound waves of the human ear, when the array wave reaches the position of the human ear, the human auditory organ will have the corresponding sound perception.

In addition to air, water, metal, wood, etc. are also capable of transmitting sound waves, and they are all good mediums for sound waves. In a vacuum, sound waves cannot propagate.

A sine wave is the simplest form of wave. When a high-quality tuning fork vibrates, it produces a sinusoidal sound wave.

Sine sound waves are pure tones. Any complex sound wave is a composite wave formed by the superposition of multiple sine waves, which are compound sounds that are different from pure tones. A sine wave is the basic unit of a variety of complex sound waves.

Pathways of sound propagation.

Sound source—auricle—external auditory canal—tympanic membrane—ossicles—cochlea—auditory nerve—brain. The speed at which sound travels in different mediums is also different. The propagation speed of sound is related to the counter-equilibrium force of the medium, which means that when a molecule of a substance deviates from its equilibrium position, the surrounding molecules will squeeze it back into the equilibrium position, and the greater the counter-equilibrium force, the faster the sound will propagate.

Data Extensions.

We had a school sports day this week, and I had three classes in this class. The effect is different for each class. I have summarized the following three typical problems.

Problem 1: Children confuse "generation" with "transmission".

The children had already learned how sound is produced in the previous lesson, and when I hit the snare drum before the lesson, I was asked the question: children, do you know how sound is transmitted? Yes: Sound is transmitted by the vibration of an object, and sound is transmitted by the vibration of the air.

I took the experiment of beating the snare drum from the previous lesson and asked the children to do it all over again, and at this time they were asked to focus on how sound is transmitted. Children can basically sound airborne.

Problem 2: Regulation of classroom discipline when banging on the table.

Fourth-grade children are already starting to be a little naughty in third-grade. When I was in the first class, I compared the experiment by tapping the table with not tapping the table, and the students were very happy and knocked on the table vigorously, causing the children to feel the joy of tapping the table, and the focus was shifted. By the second class, I changed my strategy and said good percussion rules.

Let's compare one to one group and do a better job. At this time, there was a big change.

Problem 3: When the tuning fork is put into the water, the children do not listen to the sound.

After striking the tuning fork, I asked the children what the substance that transmits sound at this time, and they and I were air, and it was still difficult for them to distinguish it. So I changed the method and when I finished this experiment, I asked the children to recall that we could hear sounds when we went to the aquarium, and to recall examples of sound propagating sounds in life to support the teaching.

The three ways in which sound travels are: air, liquid, and solid.

The speed of sound propagation in different media is also different, and the speed of sound propagation is related to the counterbalance force of the medium, which means that when a molecule of a substance deviates from its equilibrium position, the surrounding molecules will squeeze it back to the equilibrium position, and the greater the counterequilibrium force, the faster the sound will spread.

Matter is required for sound propagation, and such matter is called the medium of sound in physics. The speed of propagation of sound: shouting hunger v <>

Expand your knowledge:

Sound is a wave generated by the vibration of an object, which is a wave phenomenon that travels through a medium (air or solid, liquid) and can be perceived by the auditory organs of humans or animals. The propagation speed of sound at different temperatures: v high >> v low (refers to temperature).

The object that initially emits vibration (vibration) is called a sound source, sound is transmitted in the form of a wave (vibration), sound is the movement formed by the propagation of sound waves through any medium, sound is a wave, can be recognized by the human ear (frequency between 20Hz-20000Hz), called sound.

Vibrations from a sound source strike air particles that come into contact with it, causing the surrounding air particles to vibrate. The vibrating air particles cause the surrounding air particles to vibrate, and gradually transfer this vibrational energy downward.

As a result, the air particles are centered on the sound source, distributed in dense phases, and transmit the vibrations of this dense change to distant places. When this vibration is transmitted to our eardrums, we can hear the sound coming from the sound source.

The production of sound is due to the vibration of the object, and the sound is the fluctuation of the stool argument caused by the vibration and rough return of the substance, which needs to be transmitted by the medium to be heard. The object that emits sound is called a "sound source", and the sound source relies on its own vibration to produce sound.

Sound travels through a medium, including air, liquid, or solid, and sound cannot travel in a vacuum.

The speed at which sound travels in different media with hail difference is also different. The propagation speed of sound is related to the counter-equilibrium force of the medium, which is that when a molecule of a substance deviates from its equilibrium position, the surrounding molecular source will squeeze it back to the equilibrium position, and the greater the counter-equilibrium force, the faster the sound will spread.

Sound is generally transmitted through the air as a medium.

The propagation of sound, must have a medium to assist in order to achieve a good transmission effect, if in a vacuum, the general sound can not be smoothly transmitted, so the relevant physical knowledge we usually have to consult with professional teachers, learning will be better and more professional, and it can also make us more accurate when using.

Sound is produced due to the vibration of the object, so there must be a medium when propagating, it can also be solid, liquid, gas, sound in the solid propagation speed is the fastest Zen Chang.