1. Types of waves 2. The wave equation of motion: y(x,t) = ymsin(kx ...
1. Types of waves 2. The wave equation of motion: y(x,t) = ymsin(kx ...
1. Types of waves 2. The wave equation of motion: y(x,t) = ymsin(kx ...
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“Yardsticks” for the dB system<br />
β = 10 log(I/I 0 ) decibels (dB)<br />
threshold <strong>of</strong> human hearing<br />
rustling leaves<br />
conversation<br />
jack hammer<br />
rock concert<br />
threshold <strong>of</strong> pain<br />
jet engine<br />
10 log(I 0 /I 0 ) = 10 log(1) = 0 dB<br />
10 dB<br />
60 dB<br />
90 dB<br />
110 dB<br />
120 dB<br />
130 dB (can cause the ear to<br />
bleed)<br />
PHYS 1101, Winter 2009, Pr<strong>of</strong>. Clarke 9
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