Is the sound going up or down

Both animals and humans transmit sound through their vocal cords, and with sound we can communicate and reproduce. So, is the sound going up or down?

Whether the sound is going up or down.

Briefly. Sound travels upward, but not just upward; Sound can travel in all directions. Because sound travels through a medium, sound can be transmitted in a specific way. Details:

In most cases, it should be common sense that sound is transmitted by the vibration of the air. The same is true for other media. That is, the source of vibration first causes the nearby air to vibrate, and this air vibration will propagate to the surrounding area.

The frequency and intensity of this air vibration is within a certain range, and we can hear it.

Whether the sound is going up or down.

The essence of air vibration is that part of the air is continuously compressed by the vibration source, and the elasticity of the compressed air will expand outward layer by layer, forming the so-called sound wave. Humans can hear sounds between 20 Hz and 20,000 Hz, below 20 Hz or above 20,000 Hz, which is infrasound.

and ultrasound, we humans can't hear it. But some animals can be heard.

Whether the sound is going up or down.

Sound waves have energy, and energy is consumed and attenuated in the process of propagation. It can also be scattered or absorbed by other objects. So in the ** hall or recording studio, we often see walls decorated with materials that absorb sound waves.

It is to prevent excessive reflection of sound from forming noise.

Whether the sound is going up or down.

In nature, the sounds produced by the earth, such as the sound of wind, thunder, waves, etc., will also gradually attenuate in the process of propagation. When these sounds decay below 40 decibels, creating a background sound, we feel that the environment is quiet. Eventually, the sound produced on Earth will disappear completely due to attenuation.

Whether the sound is going up or down.

Sound can also travel within solids or liquids, and it will travel a little faster. Because the principle is similar to airborne, I won't repeat it.

Sound is a pure wave, not a substance in itself, and cannot be transmitted without matter. The speed at which sound travels has nothing to do with the direction, only with the substance that travels it. For example, in the air, the propagation speed in hot air is fast, and the propagation speed in cold air is slow.

Sound is a type of energy, and if a sound encounters a black hole, if the sound is sucked in. The sound also has weight, as if a black hole can suck it in, but you can't suck the sound into it, and there should be no sound if it has weight.

When vibrations produce waves, they make sounds. Sound has no weight, but the medium of propagation does. For example, in the speech of air, the air has weight, in the speech of water, the water has weight, but the sound itself has no weight.

The velocity of sound is in the same medium and is theoretically direction-independent. However, the medium itself has weight, so in the environment of gravity, the speed of sound that deviates from the direction of gravity is a little slower, that is, on the earth, the upward speed of sound is slightly slower.

Is it loud that the sound travels upwards or loudly downwards? I think generally the sound travels upwards, because when you shout, the voice rushes upwards with the qi. So I think still. The voice spread online is loud.

Not necessarily. The direction of propagation of sound is determined by the direction of vibration of the medium, and it can be in all directions or "directional", but because the wavelength of the sound wave is long, it can bypass the object (diffraction phenomenon), so it can be "heard before the person who sees it". Matter is needed for sound propagation, and in physics such matter is called a medium, which can be air, water, or solids.

Of course, in a vacuum, sound cannot travel. The speed at which sound travels in different mediums is also different.

Generating 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 medium-air molecules to vibrate rhythmically, causing the surrounding air to produce dense changes, forming sparse 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.

Therefore, sound in general always contains a certain frequency range. 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.

But this is not related to nouns such as wave particles.

Sound generation and propagation.

It's all the same, the path of sound is reversible.

Depending on the direction in which the sound is made, waves are all the same.

Sound can travel upwards or downwards.

Sound is a sound wave produced by the vibration of an object. It is a wave phenomenon that propagates through a medium (air or solid, liquid) and can be perceived by the auditory organs of humans or animals. An object that initially emits vibrations (vibrations) is called a sound source.

Sound travels in the form of waves that vibrate (vibrate). Sound is the motion formed by the propagation of sound waves through any medium.

The propagation speed of sound in different media is generally solid, liquid and gas, and the propagation speed of sound is related to the type of medium and the temperature of the medium.

Sound is a kind of wave, all of which have the properties of waves, and the direction of wave propagation is to all sides, so theoretically the effect should be the same when the distance is the same!

However, since it is a type of wave, it should also have other properties of the wave, such as diffraction of the wave, overlapping, etc., as well as being affected by its medium.

When a person makes a sound, the sound first comes out of the vocal cords, and then through the air, the person's body spreads outward, but the most important thing is through the air, and after many overlaps in the oral cavity, it is transmitted from the direction of the oral cavity, so the direction of the oral cavity will be strengthened, and the opposite direction will be weakened, forming a hearing effect!

It depends on the form of vocalization of the vocal body to see if there is directionality.

In general, from an energy point of view, when not directional, what propagates upwards is about the same as the loudness that propagates downwards to the human ear! (all other things being equal).

The magnitude of the sound volume is reflected in the specific wave, which is the amplitude of the wave's vibration.

The louder the sound, the greater the amplitude of the vibration, and with the same consumption, the amplitude of the vibration becomes smaller and smaller as the sound propagation, and the rate of getting smaller is the same. So, the greater the initial vibration amplitude, the longer the propagation time, and conversely, the less propagation time. When propagating in the same medium, the sound propagates at the same rate, so the louder the sound, the farther it travels, and vice versa.

Generally speaking, the propagation speed of sound is only related to the medium, and the propagation speed of the same medium will be somewhat different under different conditions, but this is the result of scientific research, and there is no need to study it in detail.

Sound is the propagation of energy in the form of sound waves by the emitter. Generally speaking, the distance of sound propagation is large or the speed is slow, the energy consumption is large, if all the energy of the sound wave is consumed in the propagation process or the sound wave changes direction, the human ear will not be able to hear the sound. The speed of sound propagation is greatly related to the type and condition of the elastic medium, which is generally said to be 340 meters per second, and its propagation medium is 15 standard air.

In fact, the air around us cannot be "standard", and its condition is inseparable from the combination of various meteorological elements (that is, the state of the weather).

Studies have shown that the propagation speed of sound is proportional to temperature, and in near-surface strata, when the temperature decreases with altitude, the propagation velocity of sound decreases with altitude, and the sound rays will bend upwards (commonly known as "sound takes off"). On the contrary, when the temperature increases with the altitude, the propagation speed of the sound will increase with the altitude, and the sound wave rays are bent downward, giving people the sense of "sound sinking".

During the rainy day, the air temperature is relatively low, and the closer to the ground, the higher the air temperature, and the rays of sound are bent towards the air, so that people on the ground are not easy to hear distant sounds. In the evening when the weather is clear, after the sun sets, the ground heat begins to radiate to the air, so that within a certain range, the air temperature rises with the increase in height, the sound rays bend downward, the sound energy is mostly transmitted along the ground, the energy loss is small, and the human ear is easy to hear the sound. Grassroots meteorologists also use the magnitude of thunder on summer evenings as an auxiliary indicator for weather forecasting.

At noon in summer and autumn, the underlying surface is heated and heated, the maximum temperature of the bare ground can reach more than 60, the temperature of cement and asphalt pavement is higher, and the air temperature is lower in comparison (the air temperature generally does not exceed 40).So in the middle of the summer, the surrounding environment seems very quiet, and it is a good time to take a lunch break. In the evening, the ground has already cooled, the air temperature drops less, and the sound waves bend downward, so the surrounding sounds can be heard more clearly, especially in the countryside where the underlying surface is mostly mud, and the sound transmission effect is more clear.