CREATING SOUND - LAB
How the major musical instruments
Applied uses of sound.
What we hear from all musical
instruments is produced by sound waves. A sound wave is a form of a
physical wave. A wave is a disturbance caused by the movement of energy
from one place to another. The ability to sense sound is not only
essential for survival, but is also a source of pleasure.
Instruments which produce sound have
been around since the dawn of mankind. The earliest instruments
were various kinds of percussion producing instruments in the form of
drums, which were struck by the hand or sticks. String instruments
and woodwinds came later.
When a person listens to music he or she
hears many different sound waves. Waves that occur together may
change each other by the process of interference.
The difference between pleasant musical
sounds and noise results from interference. You are able to hear a
radio or "boom box" playing in the next room because waves are able to
move around a barrier such as a wall or door because of diffraction.
The pitch or tone of an instrument
results from the frequency at which the instrument vibrates.
Higher pitched instruments such as violins and flutes vibrate at higher
frequencies. Lower pitched instruments such as tubas or bass
violins vibrate at lower frequencies.
Students will use three major groups of
instruments and a frequency meter to determine the number of waves per
second produced by each group of instruments.
Students will blow through flutes and use a frequency meter to determine
the number of waves per second. Using finger tips, students will
strike the edge and middle of a bongo drum and again measure the wave
frequency. Students will pluck one violin string and measure the