Loudness of Sound in Decibels
Average Home 40-50
Loud Music 90-100 After long
Rock Concert 115-120 Progressive
Jet Engine 120-170 Pain
KINDS OF SOUND WAVES
1. AUDIBLE SOUND
- human ear can hear
( 20 – 200 000 Hz)
2. ULTRASONIC WAVES
above 20 000 Hz
- Cannot be detected by human ear but some
- Dogs can detect as high as 50 000 Hz and bats
can hear up to 100 000 Hz.
- Uses in ULTRASOUND
- Sound below 20 Hz.
SOURCES OF INFRASOUND:
- Vibrating heavy machines
- It cannot be heard by human ear but can cause
3. INFRASOUND WAVES
Sound is produced when an object
When an object vibrates it exerts
a force on the surrounding air
Loudness of a sound is recorded in
As a sound gets louder, the
amplitude of the wave increases.
The moving air mass carries the
sound of the vibration to your ear.
The air is the MEDIA that it travels
Medium is what the wave travels
through (ex. solid, liquid, gas)
NO MEDIUM NO SOUND!!!!