Sound Waves

Topics: Sound, Ear, Auditory system Pages: 7 (1931 words) Published: November 22, 2013
Timeline

November 1st: I decided to brainstormed possible topics about sound waves, what interests me and what I would like to learn about.

November 4th: I started to research the basics and a sound wave and its properties. I also to notes on what a sound wave is and how frequency affects a sound wave.

November 7th:
Possible Topics
What is a sound wave
The Nature Of a Sound Wave
Sound waves through different mediums
Instrumental sound waves
How microphones and headphones work
How humans interpret sound (range of hearing)
Convert Sound Waves Into Electromagnetic Energy
The Speed of Sound
The Doppler effect
Properties
How you measure sound waves
Real life examples on sound waves
Wild life sound waves
Reflection, Refraction, and Diffraction
Forced Vibration
Standing Wave Patterns
Bibliography

http://www.engadget.com/2011/09/20/researchers-convert-soundwaves-into-electromagnetic-energy-sile/ http://www.phys.unsw.edu.au/music/guitar/guitarintro.html
http://www.physicsclassroom.com/mmedia/waves/gsl.cfm
http://en.wikipedia.org/wiki/Doppler_effect
http://www.mediacollege.com/audio/microphones/how-microphones-work.html Future Plan
Project Day: Bring in speakers, instruments and different mediums. Also incorporate Ruben’s tube. We want show everyone how sound waves are in our everyday life’s and that they surround us all the time.

What are Sound Waves?
Sound is a part of our everyday experience. Just as humans have eyes for the detection of light and color, so we are equipped with ears for the detection of sound. We seldom take the time to understand the characteristics and behaviours of sound and the mechanisms by which sounds are produced and detected. The basis for an understanding of sound, music and hearing is the physics of waves. Sound is a wave that is created by vibrating objects and sent through a medium from one location to another. In this report, we will investigate the properties, behaviours of sound waves and apply basic wave principles towards an understanding of our daily life.

What is a sound: Sound is a mechanical wave that is an oscillation of pressure transmitted through some medium (like air or water), composed of frequencies which are within the range of hearing. The Basics of Sound Waves

Pitch: This is how high or low a sound seems.
A bird makes a high pitch. A lion makes a low pitch.

Sounds also are different in how loud and how soft they are. The more energy the sound wave has the louder the sound seems. The intensity of a sound is the amount of energy it has. You hear intensity as loudness. The amplitude or height of a sound wave is a measure of the amount of energy in the wave. In a nutshell, the greater the intensity of a sound, the greater the amplitude.

Pitch and loudness are two ways that sounds are different. Another way is in quality. Some sounds are pleasant and some are a noise. Compare the two waves on the right. A pleasant sound has a regular wave pattern. The pattern is repeated over and over. But the waves of noise are irregular. They do not have a repeated pattern.

Generic properties
Sound waves have different properties associated with them. For example, each sound wave has a different amplitude, direction and frequency etc. The image below shows how each sound wave has a different frequency. Frequency, or its inverse, the period

Wavelength
Wave number
Amplitude
Sound pressure
Sound intensity
Speed of sound
Direction
Sound Units
So how exactly do you measure sound? Well it can be measures with different units as shown below. A sound unit is any acoustic unit of sound measurement. bel, B - a logarithmic unit of sound pressure equal, measured a tenth of it in decibels dB.

dB, decibel - a logarithmic unit of sound pressure; 20 times the logarithm of the ratio of the sound pressure to reference pressure, the threshold of hearing. The sound intensity may be calculated from that measurement.

sone - a unit of...
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