What is the approximate speed of sound propagation?

The speed at which sound travels through the air is 340m s. 1. What factors are related to the propagation speed: the speed of sound propagation in the air is related to the density of the obstructing object, because the propagation of sound is easy to be obstructed or absorbed, first of all, the dense object is easy to block the sound and reflect the sound back, so that a reflection will make the speed smaller, and the low density will easily let the sound penetrate the past part, so that the speed is also changed; Absorption means that there is a possibility that the sound energy will decrease during the propagation process, and the decrease of sound energy will make the speed of sound.

In fact, the object that reduces the sound energy and blocks the sound is the medium in the propagation, but the density and its friction are in the same medium.

Almost the same, so the same medium does not have a big effect on the speed of soundTherefore, the factors that change the speed of sound are: the density of the medium, the friction of the same medium (it does not change much, so people unify the speed of sound of each medium, which is really different.)

2. The reason for the slowest propagation in the air: If the source of the wave that produces the sound remains the same, the frequency of the wave will not change, so the propagation speed of the sound is related to the medium. Sound travels at different speeds in different mediums.

In fact, the medium resists the equilibrium force.

The size determines the speed of sound propagation, and is proportional, the greater the resistance balance, the faster the sound propagation; The opposite is true. So what is the countervailing equilibrium of the medium? We all know that all matter is made up of molecules or atoms.

When a molecule or atom of a substance does not want to be in equilibrium and deviates from the equilibrium position, then the molecules or atoms around it will not allow it to deviate, and then squeeze it together to return to the equilibrium position. Liquids are more resistant to equilibrium than air, while solids are more resistant to equilibrium than liquids. Therefore, we say that sound travels the slowest in the air and the fastest in solids.

The speed of sound propagation is also closely related to the density of the medium and is directly proportional. The denser the medium, the faster the sound travels, and vice versa. So what kind of medium is dense?

The tighter the atoms or molecules that make up a substance, the denser and tougher it becomes. Therefore, in solids, liquids, and air, the density should be arranged in such a way as follows: solid, liquid, and air.

As a result, sound travels the slowest in air and the fastest in solids. The speed at which sound travels is also related to temperature and is directly proportional. The higher the temperature, the faster the sound travels, and vice versa.

Therefore, if the sound encounters an upward thermal, the speed of the sound propagation will immediately increase. Conversely, if it is cold air, then the speed of sound propagation will also slow down.

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.

Factors influencing the speed of sound propagation:

1. The propagation speed of sound is related to the counter-equilibrium force of the medium, which is that when a molecule of the substance deviates from its equilibrium position, the surrounding molecules will squeeze it back to the equilibrium position, and the greater the counter-equilibrium force, the faster the sound will propagate. Water has a greater counterbalance than air, and iron has a greater counterbalance than water.

2. The propagation speed of sound in the air is also related to the pressure.

3. The speed of sound in the air changes with the change of temperature, and the speed of sound rises and decreases by 3m s for every 5 rises and decreases in temperature.

4. The propagation speed of sound increases with the increase of the toughness of the substance, and the density of the substance decreases and decreases. In general, at the same temperature, the sound transmission of solids is the fastest, followed by liquids, and gases are the slowest; In the same medium, the lower the temperature, the slower the speed of sound.

5. The propagation of sound is related to resistance. Sound can be refracted by external objects, such as when a person shouts in front of a mountain, he can hear his own echo.

The speed of sound propagation is about 1050 kilometers.

The speed at which sound travels through the air is 340m s.

The propagation speed of sound in different media is generally solid, liquid and gas (exceptions, such as: cork 500m s, less than kerosene (25), distilled water (25), etc.), and the propagation speed of sound is related to the type of medium and the temperature of the medium.

The speed at which sound travels through various types of objects:

1. Vacuum 0m s (that is, it cannot be propagated).

2. Air (0) 331m s

3. Air (15) 340m s

4. Air (25) 346m s

5. Cork 500m s

6. Kerosene (25) 1324m s

7. Distilled water (25) 1497m s

8. Seawater (25) 1531m s

9. Ice 3230m s

10. Copper (rod) 3750m s

11. Marble 3810m s

12. Aluminum (rod) 5000m s

13. Iron (rod) 5200m s

The propagation velocity of sound in the air is: air (15) 340 m s, air (25 ) 346 m s. Sound varies according to the speed of propagation in different substances.

When people walk normally, the speed is about 1m s, when we walk for 1 second, the sound has almost run half a lap of the playground, and after another 1 second, the sound has almost run 1 and a half laps.

Maybe you don't have much feeling about 340m s, we change it to km h, 340m s 1224km h, the speed of the bus we usually sit is generally 40km h, the taxi is almost 60-80km h, the speed of the bullet train or high-speed rail between Chengdu and Chongqing is about 350km h, the speed of the high-speed rail is already very fast, but it is less than one-third of the sound speed.

The speed of the planes taking off and landing at Jiangbei Airport every day is almost 900km h, which is only seven-tenths of the sound speed.

The speed of sound is about 340 m/s at standard atmospheric pressure.

The magnitude of the speed of sound varies depending on the nature and state of the medium. Generally speaking, the value of the speed of sound is greater in solids than in liquids, and in liquids it is greater than in gases. The speed of sound in the air is about 340 meters and seconds, or 1224 kmh, under standard atmospheric pressure conditions.

The magnitude of the speed of sound also varies with the temperature of the atmosphere, and in the troposphere, as the altitude increases, the air temperature decreases and the speed of sound decreases. In the lower stratosphere, the air temperature does not change with altitude, and the speed of sound does not change, which is meters and seconds. The law of air flow and the aerodynamic characteristics of the aircraft have a huge difference between the flight speed less than the speed of sound and the speed of sound, so the speed of sound is a very important benchmark value for studying the movement of aircraft in the atmosphere.

Influencing factors: The sound waves emitted from the sound source propagate to the surroundings at a certain velocity, which means that the energy of the sound waves also propagate to the surroundings at a certain velocity. As far as is known, sound waves are capable of propagating in all matter except vacuum.

Its propagation speed is determined by certain physical properties of the sound transmission medium, mainly mechanical properties.

For example, the speed of sound is related to the density and elastic properties of the medium, so it also varies with state parameters such as temperature, pressure, etc. of the medium. The speed of sound in the gas is about several hundred meters per second and increases with increasing temperature, the speed of sound in the air is about milliseconds at 0 and 340 meters at 15, and the speed of sound increases by about milliseconds for every 1 increase in temperature.

In general, the speed of sound is greatest in solid media, less in liquid media, and smallest in gaseous media. In addition, the speed of sound in an inhomogeneous medium varies everywhere. The speed of sound in an anisotropic medium varies with the direction of propagation.

The speed of sound propagation: at room temperature 15°, the speed of sound in solids is about 5200 meters per second, in liquids is about 1500 meters per second, and in air at 15 degrees Celsius is about 340 meters per second. For example, the speed at which sound travels in a solid:

Dali Beiqing stone 3810m s, aluminum (rod) 5000m s, iron (rod) 5200m s; Velocity of liquid propagation: seawater (25) 1531ms, ice 3230ms; The velocity of gas propagation: air (0) 331 m s, air (15 ) 340 m s.

When sound travels in solids, liquids, and gases, it travels fastest in solids and slowest in normal gases; Among solids, liquids, and gases, solids generally have the highest density and the smallest gases, so of course, the sound wave propagation is the fastest among solids, and the slowest among gas imitation widths. That is, the propagation speed is related to the density of the medium, and the sound velocity is faster when the density is high. Characteristics of sound propagation:

1.Reflection due to the fact that sound travels at different speeds in different media, the phenomenon of sound reflection and refraction occurs. The phenomenon of sound waves encountering obstacles while traveling and returning to the original medium is called reflection, and this phenomenon of sound wave reflection is also called echo.

The reflection of sound waves was experimentally proven as early as 1882. 2.Refraction: If sound is transmitted in different media, the phenomenon of deflection in the direction of propagation due to different speeds is called refraction.

Mach 1 = kilometers and seconds (kms).

Mach is a measure word that denotes speed. Mach number is double the speed of sound (sound waves can propagate in solid, liquid or gaseous media, the greater the density of the medium, the faster the speed of sound, so the size of the Mach is not fixed): the Mach number less than 1 is subsonic, and the Mach number greater than 1 or so is hypersonic speed; The Mach number is the ratio of the speed of flight to the speed of sound at that time, greater than 1 means faster than the speed of sound, and in the same way, less than 1 is slower than the speed of sound.

Extended information: When the Mach number MA", the pressure on the fluid is not enough to compress the fluid, and only causes the flow of the fluid. In this condition, the density of the fluid does not change with pressure, and this flow field is called subsonic

flow), the flow field can be considered as an incompressible flow field. Ordinary water currents and atmospheric air flows, such as turbulent rivers, typhoon wind fields, and the movement of automobiles, are incompressible flow fields.

However, when the fluid is moving at high speed (the flow rate is close to or greater than the speed of sound), the fluid density will change with the pressure, and the flow of the gas at this time is called compressible

flow）。When the Mach number is >, it is called supersonic flow (supersonic

flow), which are only encountered in aerodynamics.

Any object moving beyond the speed of sound will generate a cone-shaped energy shock wave from the head backwards (the higher the speed, the smaller the cone angle), its force may destroy the contact object, and it will rub to create high temperatures, so its body design must be limited to the range of the cone shock wave as much as possible, and at the same time, materials with high heat resistance must be used.

The speed at surface translates to Mach 1225kmh, 767mph, 1125ft s. At the same speed, the Mach of a flying object will vary depending on the speed of sound in the air at the altitude at which it is located; The higher the altitude, the lower the speed of sound, which makes the Mach higher, so the speed of the high-altitude flight decreases to avoid shocks.

In general, the speed of sound is the speed of sound in the air and is meter-second (1,236 km-h). The speed of sound varies depending on the state of the air (e.g., humidity, temperature, density, and brightness). For example, at zero degrees Celsius, the speed of sound at sea level is about 1,193 km/h; The speed of sound at an altitude of 10,000 meters is about 295 meters and seconds (1,062 metric mile hours); In addition, for every 1 degree Celsius increase, the speed of sound increases by meter seconds.

The speed at which sound travels in different media:

Vacuum 0m s (i.e. no propagation).

Air (15) 340m s

Air(25) 346m s

Cork 500m s

Kerosene (25) 1324m s early width.

Distilled water (25) 1497 ms

Seawater (25) 1531m s

Copper (rod) 3750m s

Marble 3810m s

Aluminum (rod) 5000m s

Iron (rod) 5200m s