SPEED OF SOUND
This extension involves measurements of sound intensity in a closed space. You will need learn about the superpostion of waves and build experimental apparatus for investigating standing sound waves.
Speed is the ratio of distance travelled to the time it takes, the number of meters in one second or the number of miles in one hour. The speed of a wave is often thought about in terms of one cycle of change; how far does it travel and how long does it take? The distance travelled in one cycle is called the wavelength (L), and the time is called the period (T). Wave speed (v) is then the ratio of the wavelength to the period. Often the frequency (f) is used in place of the period. The frequency and the period are reciprocals. When frequency is used to express timing, the wave speed equation becomes v = f L . To determine wave speed both frequency and wavelength must be measured.
The frequency of sound may be determined with an oscilloscope. Just about any type should work. You can
also use a computer with sofware and hardware that let it mimic an oscilloscope.