LO8 naysilla dayanara
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Transcript of LO8 naysilla dayanara
DEFINITION
Constructive and Destructive interference separated by
intervals of space
Constructive and Destructive interference separated by
intervals of time
What we hear when this happens: Variation of amplitude
as a function of time.
FIRST, CONSIDER THIS…2 waves of the same amplitude
Have slightly different frequencies: Say that they are f1 and f2.
f1
f2
Time
Checkpoint: Think about the loudness
FIRST, CONSIDER THIS…
Time
f1
f2
At first they’re in phase:Therefore they ADD UP Eventually gains up and
becomes one half cycle out of phase
Therefore, they CANCEL OUT
WHAT WILL THIS SOUND LIKE??
The result is a wave with different amplitudes
MathematicsConsider they’re in one dimension
Two waves of the same amplitude, different frequencies, different wavelength, different wave numbers
Now we have a product of two cosines:
Oscillates at mean angular frequency
Oscillates at angular frequency
difference
We hear a tone that has: Mean Frequency
Amplitude varies by the difference in angular frequency