The loudness of a sound
Loudness
• higher amplitude results in louder sounds
• measured in decibels (db), 0 db represents
hearing threshold
Decibels of Everyday Sounds
Sound
Decibels
Rustling leaves
10
Whisper
30
Ambient office noise
45
Conversation
60
Auto traffic
80
Concert
120
Jet motor
140
Spacecraft launch
180
The loudness of a sound
What happens when the amplitude of a sound wave
increase?
Tick ✅ one box.
A.
B.
C.
D.
The loudness does not change.
The loudness decreases.
The loudness increases.
The loudness increases and decreases.
Numbers of sound waves per
second is called frequency.
The higher the frequency, the higher
the pitch.
Or
The faster the vibration, the higher the
pitch.
Volume Vs Pitch (Amplitude Vs Frequency)