SOUND

1. 8.2- Describing Sound Waves
Sir. Muhammad Abdul Mageid
Cambridge VIII
Physics – CHAPTER 8

2. Describing Sound Waves

3. Frequency and Pitch
 Frequency : is the number of vibrations produced
each second
 Frequency is measured in a unit called Hertz [Hz]
 1 KHz= 1000 Hz
 As the Frequency of sound increases the pitch we
hear increases

4. Loudness and Amplitude
 The Amplitude of a sound wave is a measure of how
much energy it carries
 High amplitude sounds are louder than lower amplitude
sounds
 The high amplitude sounds are produced by larger
vibrations and carry more energy

5. Musical instruments
Q- Place each of the following musical instruments into one of
three groups –hit ,plucked and blown- depending on the way in
which they produce sound
5- Cello
plucked