What Is Acoustic Transmission?

Sound is transmitted through the medium. Sound can only be generated due to the vibration of the object. Sound is the wave generated by the vibration of the material, which needs to be propagated by the medium to be heard.

Sound transmission

The sound is caused by the vibration of the object, and the sound is the wave produced by the vibration of the material, which needs to be propagated by the medium to be heard. In the eighteenth century, scientists have confirmed from experiments that the sound wave needs media such as air to transmit. About 1,700 years ago, the Italian scientist Torricelli proposed the idea that sound is transmitted through air as a medium.

I also thought about using the experiment that the ringtone could not propagate in a vacuum to prove his claim, but because the technology of making a vacuum at that time was not mature enough, he couldn't achieve his wish. Later, British physicist Boyle invented the air extractor, evacuated the container containing the bell, and redone the experiment, which confirmed the concept proposed by Torricelli.

In 1827, scientists proved through experiments that sound can be transmitted in water, and at the same time measured the speed of sound in water. The sound wave propagating in the air is a longitudinal wave, which continuously vibrates a tuning fork, so that the surrounding air molecules form a continuous wave with dense and dense phases. In longitudinal waves, the vibrational force of the media molecules is parallel to the direction in which the wave advances.

Variables affecting the speed of sound

The speed at which sound waves travel through a medium is called the speed of sound (or speed of sound). The speed of sound often affects its speed due to factors such as the type and state of the medium. The speed of sound propagating in the air varies with the temperature, humidity, density, etc. of the air. The higher the temperature, the faster the speed of sound. When the humidity is high, the speed of sound is also fast. It is known that the sound velocity in dry, windless air at 2 ° C is about 343 m / s, and at 0 ° C, it is 331 m / s. If the speed at which an object moves exceeds the sound transmission speed of the air at that time, it is called supersonic speed. As for the measurement of the speed of sound, as early as 1636 AD, Melson, a Hong Kong resident, measured the sound velocity in the air at 316 meters per second. Although it has been continuously tested by various countries, it has been correctly found in gas or solids. The method of sound transmission speed was designed by the German Conte in 1868. This is the famous "Conte experiment". As for the commonly used sound velocity (air at O ° C) 331 meters / second, it is Revised during the First World War.