When the sound vibration propagation in air and space temperament point is not to be taken away, just in the vicinity of the original location cheap louis vuitton handbags vibrating back and fut 14 coins forth, so the propagation of sound is the transmission of vibration. If the amplitude of vibration of objects that change with time as a sine curve, then the vibration is called harmonic vibration, the air surrounding the object for simple harmonic motion but also for Simple arrangements particle vibration. Object distance from the rest position, said displacement x, called the maximum displacement amplitude α, the relationship between displacement and time harmonic vibration is expressed as x = αsin (2πft + φ), where f is the frequency, (2πft + φ) is called harmonic vibration the phase angle is to determine the movement of objects cheap louis vuitton outlet important physical state amplitude α determines the size of the intensity of the sound.
The more the number of vibrations per second,cheap louis vuitton purses, the higher the frequency, the more the human ear to hear the voice sharp tone or higher. The human ear is not all frequencies of vibration can be felt. Generally speaking, the human ear can only hear the frequency of 20 ~ Fake Oakley Sunglasses 20000hz voice, usually called the frequency range of sound audio sound. Sound below 20hz called infrasound, higher than 20000hz voice called ultrasound. Cheap Oakley Sunglasses Infrasound and ultrasound human ear can not hear, but was able to hear some animals, such as mice can hear infrasound, ultrasound can feel the bat.
But if the light is just to understand the truth, or not enough, but also have the ability. cheap louis vuitton outlet Also known as the principle of the atomic bomb it, but if the bomb exploded next to cheap louis vuitton outlet cheap louis vuitton outlet not the same as dying under the nuclear explosion, so the light is not enough to understand the principle, but also a corresponding capacity. Hyun Mo has this ability, that ability to emit ultrasonic waves from the bat, making cheap louis vuitton outlet sound has an extremely deep understanding of, and after the second tone bell rings, Hyun Mo body that have the ability to bat since played a role, but the Mo Xuan also brought to a mysterious state of being.
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