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How Are Sound Waves Produced, Transmitted and Received?

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by

Christy Ann Banguanga

on 25 November 2014

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Transcript of How Are Sound Waves Produced, Transmitted and Received?

How Are Sound Waves Produced, Transmitted and Received?
Pitch and Frequency
Quality and Timbre
The quality of sound known as timbre or "tone color" depends on the relative intensities of different frequencies of sound.
When you listen to an orchestra play you can hear many different kinds of instrument. The difference in sound quality among the instruments come from the structural differences between instruments. Musical instruments fall within these 3 families: string instruments, wind instruments and percussion instruments.
Intensity and Loudness of Sound
Transmitting Sound Waves
Characteristics of Sound Waves:
1. Intensity and Loudness
2. Pitch and Frequency
3. Quality and Timbre
layers of air when prongs are stationary
when prongs move outwards,
layers of air are compressed
when prongs move inwards,
layers of air are rarefied

Sound
is defined as the range of compression wave frequencies to which the human ear may or may not be sensitive. Logically speaking, sound exists whether it is heard or not.

Although human ear is sensitive to a wide range of sounds, experiments have shown that this range is dependent on two factors. These are intensity and frequency.

Try Doing This:
Hold your throat with your fingers and say "aha-aaa..."
Try changing the pitch as you say it.
Feel the vibration in your throat.
Try varying the loudness.
Video: Transmission of Sound
Video: How The Ear Works
compressions
rarefactions
Intensity
refers to a measurable, physical attribute of sound wave while
Loudness
concerns a physiological sensation caused by a sound wave.

The same sound may be perceived as loud or soft by two different persons, but intensity is measurable and not subject to individual interpretation.

In general, the more intense the sound, the louder it seems.
The larger the amplitude the louder the sound.
The most common unit used to express loudness is the
decibel (dB)
. The faintest sounds an average human ear can hear are at a level of
0 dB
. The level of
120 dB
is sometimes called the
threshold of pain
, because sounds at that level and higher can hurt the ears. Continued exposure to sounds above 85 dB causes gradual hearing loss by permanently damaging hair cells in the inner ear.
Frequency
of sound is measured by the number of cycles completed per unit of time. The unit for frequency is cycles per second or
Hertz (Hz)
. The
average limits of audibility
for the normal human ear ranges
from 20Hz 20,000Hz
.
Sound waves
higher
than 20,000Hz are called
ultrasonic waves
and
lower
than 20,000Hz are
infrasonic waves
. We cannot hear ultrasonic and infrasonic sound waves.
A
high-pitched
sound corresponds to a
high frequency
sound waves; a
low-pitch
sound corresponds to a
low frequency
sound wave.
Video: The Power of Resonance
Resonance
is a condition that exists when the frequency of sound source matches the natural frequency of a receiver.
Video: Musical Instruments Sound
Full transcript