Office noise — Subway, shouted conversation: 100 times louder
Office noise — School dance: ... times louder
Slide 4 - Diapositive
Can you find the pattern?
Office noise — Heavy traffic: 10 times louders
Office noise — Subway, shouted conversation: 100 times louder
Office noise — School dance: 1000 times louder
Slide 5 - Diapositive
How the decibel scale works
For every step of 10 decibel up the sound gets 10 times louder.
From 70 to 80 dB, the sound gets .... times louder
From 70 to 90 dB, the sound gets .... times louder
From 70 to 100 dB, the sound gets .... times louder
Slide 6 - Diapositive
How the decibel scale works
For every step of 10 decibel up the sound gets 10 times louder.
From 70 to 80 dB, the sound gets 10 times louder
From 70 to 90 dB, the sound gets .... times louder
From 70 to 100 dB, the sound gets .... times louder
Slide 7 - Diapositive
How the decibel scale works
For every step of 10 decibel up the sound gets 10 times louder.
From 70 to 80 dB, the sound gets 10 times louder
From 70 to 90 dB, the sound gets 100 times louder
From 70 to 100 dB, the sound gets .... times louder
Slide 8 - Diapositive
How the decibel scale works
For every step of 10 decibel up the sound gets 10 times louder.
From 70 to 80 dB, the sound gets 10 times louder
From 70 to 90 dB, the sound gets 100 times louder
From 70 to 100 dB, the sound gets 1000 times louder
Slide 9 - Diapositive
Question
a) Two people are investigating sound intensity levels in decibel. One of them measures background music to have a sound intensity of 60 dB. The other one measures a busy subway station to have a sound intensity of 90 dB. How much louder is a busy subway compared to background music?
Later they measure leaves rustling to have a sound intensity of 30 dB. Another sound source they measure makes sound that is 100 times louder. A third sound source they measure makes a sound that is 10.000 times louder.
b) what was the second sound source they measured?
c) What was the third sound source they measured?
Slide 10 - Diapositive
Sound is a wave
Slide 11 - Diapositive
What is a wave?
A disturbance that gets passed on through a medium
La durée de la leçon est: 45 min
