SOUND
NATURE OF SOUND The sound is a physical phenomenon that stimulates the sense of hearing . In humans, this occurs whenever a vibration frequency between about 15 and 20,000 hertz reach the inner ear. The hertz (Hz) is a unit of frequency corresponding to one cycle per second. These vibrations reach the inner ear transmitted through the air, and sometimes restricts the term "sound" to the transmission medium. However, in modern physics often extends the term to similar vibrations in liquids or solids. Sounds at frequencies above about 20,000 Hz are called ultrasonic.
frequency characteristics of sound: A shrill sound waves there are more than a fraction of time in a low tone. The number of waves that fit in a given time is called frequency and is measured in Hertz (Hz), the unit of frequency.
Amplitude: The amplitude of a sound wave is the degree of movement of molecules air wave, which corresponds to the intensity of thinning and compression that go with it. The greater the amplitude of the wave, the molecules hit harder and louder the drum sound is perceived.
Intensity: The distance you can hear a sound depends on its intensity, which is the average energy flow per unit area perpendicular to the direction of propagation.
Bell: If it touches the middle C is located on a violin, a piano and a tuning fork with the same intensity in all three cases, the sounds are identical in frequency and amplitude, but very different in timbre.
Speed \u200b\u200bof sound: frequency of a sound wave is a measure of the number of vibrations per second from a certain point. The distance between two compressions or two rarefactions successive wave is called wavelength. The product of wavelength and frequency equals the speed of wave propagation, which is the same for sounds of any frequency (when the sound propagates through the same medium at the same temperature). THE ECO
An echo is a reflected sound wave. The interval between the emission and the repetition of sound corresponds to the time it takes for the waves to reach the barrier and return. Often, the echo is weaker than the original sound because not all waves are reflected. Generally, the echoes heard in the mountains occur when sound waves bounce off large areas over 30 m away from the source. Tapping into a metal tube to your ear can also hear echoes.
THE HUMAN EAR
Ear, the organ responsible for hearing and balance. It is divided into three zones: outer, middle and inner. Most of the inner ear is surrounded by the temporal bone. The outer ear is the part of the hearing which is lateral to the eardrum or tympanic membrane. The middle ear is located in the tympanic cavity tympanic cavity called, whose outer face is formada por la membrana timpánica, o tímpano, que lo separa del oído externo. El oído interno, o laberinto, se encuentra en el interior del hueso temporal que contiene los órganos auditivos y del equilibrio, que están inervados por los filamentos del nervio auditivo.
CUERDAS Y TUBOS SONOROS
Cuerdas sonoras. Es un cable elástico, tendido entre 2 puntos fijos, susceptible de emitir un sonido musical gracias a sus vibraciones.
Tubos sonoros. Es un tubo de madera o de metal en general cilíndrico de sección circular o rectangular, en el interior del cual el aire en vibración presenta un sistema de ondas estacionarias correspondientes a una frecuencia audible.
PREPARED BY: MARIA CAMILA ATAYA PARAL
GRADE 7 "B"
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