Shouting into the shouting microphone, why does the voice travel farther?

If you don't understand the first floor, don't talk nonsense. The denser the medium through which sound travels, the faster the sound travels.

There are two factors that affect the speed at which sound travels: the medium and the wave source.

When the surrounding temperature changes, the density of the air changes (the higher the temperature, the greater the density, because the higher the temperature, the air expands and contracts, so the local pressure increases, that is, the density increases) that is, the medium changes.

And the denser the medium through which the sound travels, the faster the sound travels.

That is, the faster the sound travels in a warmer environment.

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 other hand, when the temperature rises with altitude, the propagation speed of sound increases with altitude, and the sound wave rays bend downward, giving people the sense that "sound is 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 up, and the maximum temperature of the bare ground can reach more than 60, and the temperature of cement and asphalt pavement is higher, and the air temperature is lower in comparison (the 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.

So that the sound waves are concentrated so that they are not too dispersed and absorbed.

Standard answers to junior high school physics.

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In a series circuit, the current is equal everywhere, so that the sound heard at the earpiece is the same as the sound spoken at the microphone.

Then the current converted at the microphone must be the same as the current in the coil in the earpiece Therefore, the microphone and the earpiece must be connected in series in the same circuit, so as to achieve long-distance AC Because the current in the series circuit is equal everywhere, the series connection between the earpiece and the other microphone can ensure that the current strength change between the two is consistent, so that the vibration of the thin iron sheet of the earpiece and the diaphragm in the opponent's microphone is consistent Ensure that the sound heard is the same as the voice of the other party

I've been in this situation too, and sometimes it can be a network issue with a mobile phone, which is usually the case with landlines**. I don't know what the specific reason is!

When the voice is loud, the microphone will turn the sound waves of different intensity into the corresponding size of the electrical signal, because the microphone and the earpiece are in series, so the earpiece will receive the same electrical signal from the other party, and the electromagnet will turn the electrical signal into the strength and weakness of the diaphragm, and the transmitted sound will be far away.