Sound wave

Sound wave(It is the ぱ) with, in narrow sense in the air the audio frequency which is spreadElastic waveWhen the creature receives with the tympanic membrane, it points to physiological feeling. In broad sense, the elastic body it is that general term of the elastic wave which is spread the vapor and the liquid, regardless of the solid matter. When you observe objectively, the thing vibrating, wave motion only has occurred. When being interest in the wave motion, you say that there is a sound.

At the time of meaning the narrow sense, the elastic wave above audio frequency of the human other than the sound wave ultra wave and audio frequencyInfrasonic waveWith it calls.

In the vapor and the liquid, it slips and because elasticity does not exist as for the sound waveRoughness and fineness waveIt is spread asLongitudinal waveSo it is. In the solid matter it is the surface wave other than the roughness and fineness waveShear wave(The distortional wave) occurs.

That it is spread by temperature and medium speed differs, but if it is in the air of normal temperature, the sound wave is spread at per second velocity approximately 340 m. iron lump to be quicker sound is audible. In this case immediately from the iron it is transmitted to the tympanic membrane. Also the sound which is heard at underwater immediately from the water liquid is transmitted to the tympanic membrane. As for some it is thought in actuality that also the air lies between.

Sound wave living thingHearingWhen the organ catches, physiological feelingSoundIt is recognized as. In the sound wave you cannot recognize with the organ of hearing of the person, but there are also those of the high frequency zone which is called the ultra wave which it is possible to the 蝙 蝠 and the like. The 蝙 蝠 uses this zone, can fly even with the darkness.

As for those which can be recognized generally with the organ of hearing of the person 20 Hz? 20 KHz It is assumed that is. 1? At 5 Hz as sound not be able to recognize the person, as a pressure to the skin and the likeTactual senseIt is perceived by. Those where the feeling for this pressure advances to be hearing, as for the person mainlyTympanic membraneThis is caught with. Usually it is transmitted through the air, but, it meaning that also it is possible to recognize that with the bone evangelism which tactual sense is done immediately in the nerve there is also that kind of hearing aid. When the handicapped person of the ear (the tympanic membrane tears) it can also inquire about music with that.

Hearing of living thing andTactual senseSo as for the vibration of the sound wave which was perceived, in case of the especially person besides the fact that intention phase it has become also one form, little a some psychological change it is induced, it occurs with that the feeling of pleasantly displeasure becomes the prototype which generates the culture, music. It is unclear, but the system which is called music at least exists and the person is pulled and that it is commercialized, it is known well there is the mere vibration and the way why it accompanies the psychologial factor. Fundamental tone harmonic overtoneMusical toneWith to call, sound other than that噪 soundWith you say. music, the position which is unique to the musical tone is given. Namely, sound of the melody and chord is the musical tone. But, percussion instrument sound is used mainly.

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