How is sound produced and transmitted? How fast is the sound?

Sound is produced by the vibration of the object, and when the vibration stops, so does the sound. Sound emitters can be solid, liquid, or gaseous. For example:

The sound of the wind, the rain, the sound of reading, the sound of the voice", one of them"The sound of the wind"It is made by the vibration of air (gas); "The sound of rain"It is made by the vibration of rain (liquid); "The sound of reading"Vocalization is produced by the vibration of the person's vocal cords (solid).

Sound travels in the form of sound waves, and the vibrations of the sound source provoke sound waves in the surrounding substance. It enters the human ear and causes the eardrum to vibrate to produce hearing. Sound propagation requires a medium, and all gases, liquids, and solids can be used as a medium for sound propagation.

And in a vacuum, there is no medium for these sounds to propagate, so the vacuum cannot transmit sound.

The sound can be high-pitched or low-pitched. The pitch depends on the frequency of the sound (the number of vibrations per second). The strength of the sound depends on the amount of vibration that produces the sound.

If the vibration is large, the sound will be strong; The vibration is small and the sound is weak. The magnitude of sound is measured in decibels. The noise generated by the drilling rig that repaired the road was more than 100 decibels.

In general, sound waves travel through the air at a speed of about 340 meters per second.

The propagation of sound requires a medium, and a vacuum cannot transmit sound. The sound room is transmitted by all gases, liquids, and solids as mediums, and these substances as the medium of transmission are called mediums.

The speed at which sound travels is related to the medium.

The speed at which sound travels in different media is related to temperature and type of medium. The speed of sound increases with the increase of temperature, and the distance of sound propagation in the air increases by about 0 6 m per second for every 1 increase in temperature. The sound is fastest in solids, followed by liquids, and slowest in gases.

For different media to propagate sound at different speeds, the higher the temperature in the same medium, the greater the sound velocity; And the speed of sound travels slightly faster in warm air than in cold air. The speed of propagation of sound in the air is 15m s 340m. The speed of sound propagation depends on the type of medium, and in general, it is fastest in solids, followed by liquids, and slowest in gases.

Sound principle: Sound is a kind of pressure wave: when playing a musical instrument, slapping a door or knocking on the tabletop, their vibration will cause the rhythmic vibration of the medium-air molecules, causing the surrounding air to produce dense changes, forming dense longitudinal waves, which produce sound waves, and this phenomenon will continue until the vibration disappears.

As a kind of wave, frequency and amplitude have become important properties to describe the wave, the magnitude of the frequency corresponds to what we usually call pitch, and the amplitude affects the magnitude of the sound. Sound can be broken down into superpositions of sine waves of different frequencies and intensities. This process of transformation (or decomposition) is called the Fourier transform.

The propagation of sound requires a mediumThe propagation of sound requires a medium, usually the speed of sound refers to the speed of sound in the air, and the speed of sound will have different values depending on the state of the air.

For example, the speed of sound at sea level at zero degrees Celsius is about 295 m s at an altitude of 10,000 meters, and the speed of sound increases for every 1 degree Celsius increase.

The speed of propagation in different mediaThe speed at which sound travels in different media is:

Vacuum 0m s (i.e. cannot be propagated).

Air(15)340ms

Air (25) 346m s

Cork 500m s

Kerosene (25) 1324m s

Distilled water (25) 1497 ms

Seawater (25) 1531m s

Copper (rod) 3750m s

Marble 3810m s

Aluminum (bar) 5000m s

Iron (rod) 5200m s

The speed of sound propagation in the air is: air (15) 340m s, air (25) 346 m s.

Sound varies according to the speed of propagation in different substances. The propagation of sound is also related to temperature and resistance, as well as different densities. It affects the speed at which sound travels.

The speed at which sound travels through different media.

Vacuum 0m s (i.e. cannot be propagated).

Air(15)340ms

Air (25) 346m s

Cork 500m s

Kerosene (25) 1324m s

Distilled water (25) 1497 ms

Seawater (25) 1531m s

Copper (rod) 3750m s

Dali wide void stone 3810m s

Aluminum (bar) 5000m s

Iron (rod) 5200m s

Vacuum 0m s (i.e. non-grinding energy propagation).

Air(15)340ms

Empty blind Qiaoqiao gas (25) 346m s

Cork 500m s

Kerosene (25) 1324m s

Distilled water (25) 1497 ms

Seawater (25) 1531m s

Copper (rod) 3750m s

Marble 3810m s

Aluminum (bar) 5000m s

Iron (rod) 5200m s

The propagation of sound requires matter, and in physics, such a substance is called a medium, which can be air, water, or solid, of course, in a vacuum, sound cannot be propagated, and the propagation of sound is related to temperature and resistance.

The speed at which sound travels in different media is not the same:

At air 15, the propagation velocity is 340m s.

At air 25, the propagation velocity is 346m s.

In water at room temperature, the propagation velocity is 1500m s.

At seawater 25, the propagation velocity is 1530m s.

In steel, the propagation velocity is 5200m s.

In ice, the propagation velocity is 3160m s.

In cork, the propagation velocity is 500 m s.

In pine, the propagation velocity is 3320 m s.

In nylon, the propagation velocity is 2600m s.

In cement, the propagation velocity is 4800m s.

The propagation velocity of sound in air is (15) 340 m s or (25 ) 346 m s, in cork it is 500 m s, in distilled water it is (25) 1497 m s, and in seawater it is (25) 1531 m s. The propagation of sound requires a medium, and the propagation speed in different substances is also different.

The propagation speed of sound in different media is not the same, and the propagation speed of solid, liquid and gas, for example, cork is 500m s, which is less than kerosene (25), distilled water (25), etc., in addition, the propagation speed of sound is also related to the temperature of the medium.

Sound travels slightly faster in warm air than in cold air. In the air of 0, the air can only travel 331 meters per second; In 21 years of moderate temperature, it can propagate 343 meters per second.

The propagation velocity of sound in the air is: at 15, it is 340m s; At 25, it was 346m s.

The speed of sound propagation in the air is also related to pressure and temperature, the propagation of sound requires substance, such a substance is called a medium in physics, the speed of sound in the air changes with the change of temperature, the temperature rises and falls by 5, and the speed of sound rises and falls by 3m s.

Note: The most critical factor for sound propagation is to have a medium, which refers to all solids, liquids and gases, which is the premise for sound to be propagated. The physical parameters are related to the distance of the sound source from the observer, the vibration frequency of the sound source, and the propagation medium.

The propagation speed of sound increases with the increase of the toughness of the substance, and the density of the substance decreases, for example: the propagation speed of sound in ice is faster than that of sound in water, the toughness of ice is stronger than that of water, but the density of water is greater than that of ice, which reduces the gap between the propagation speed of sound in water and ice.