Page 66 - Science Course 3 (Book 2)

Mo10-L3a: What are the Properties of Sound Waves?

The perception of how high or low a sound seems is Different frequency (pitch) but same amplitude
called pitch. (volume)

The higher the frequency, the higher the pitch of the 6
sound. 4 2
Amplitude 0.0

Male Voice –2
–4
Female Voice –6

6
4
2
The more energy you put into your voice, the farther 0.0
the particles in the air move as they vibrate. –2
–4
The distance a vibrating particle moves from its rest –6
position is the amplitude.
Amplitude
The more energy used to produce the sound wave,
the greater the amplitude. Sound waves travel much more slowly than
electromagnetic waves because with sound, the
transmitted energy must pass from particle to
particle.

Amplitude The type of medium and the temperature affect the
speed of sound.

The Speed of Sound
Same frequency (pitch) but different amplitude
(volume) Material Speed (m/s)

Air(00C) 331
6
4 2 Air(200C) 343
Amplitude 0.0 Water(200C) 1,481

–2
–4
Water(00C) 1,500
–6
6 Seawater(250C) 1,533
4
2 Ice(00C) 3,500
0.0
–2 Iron 5,130
–4
–6 Glass 5,640

Amplitude
A gas takes longer to transfer sound energy between
particles.

Particles move faster and collide more often as the
temperature of a gas increases.

58