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2. adevice created or adapted for the
purpose of making musical sounds
A musical instrument that produces
sound by means of vibrating strings.
 Also called chordophones.

3. Lutes – strings are supported by a
neck
guitar
violin

4. Harps – strings contained in a
frame

5. Zithers – strings
mounted on a
body

6.  Created by a vibrating object.
 Vibrating object = source of disturbance
that moves through the medium.
 Examples of medium: vocal chords,
vibrating guitar strings
 the particles of the medium through
which the sound moves is vibrating in a
back and forth motion at a given
frequency

7.  the number of waves that
pass a fixed point in unit time.
 “how often” the air particles
vibrate.
 Measured as the number of
complete back-and-forth of a
particle of the medium per unit of
time.

8. Factors that determine frequency (plain
steel string)
tension
length
mass per unit length of the string
Formula:

9.  Longer string = lower frequency
 Frequency is inversely proportional to the
length of the string
 Change in length of string = different
frequency
 Shorter strings = higher frequency =
higher pitch

10.  Diameter = thickness
 Thick strings vibrate slower
 Slower vibrations = lower
frequencies

11.  Tension – how tightly the string is
stretched
 Tighter string = higher tension = higher
frequency
 Loosening string = lower tension =
lower frequency

12.  The relationship between tension and
frequency is determined by how fast the
wave moves on the string.
 Thin strings vibrate faster and have
higher frequencies than thick ones.
 Higher frequency = higher pitch
 Loosening the string gives it a higher
frequency while tightening the string
gives it lower frequency.