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10 cards from this deck
Pulsing effect when 2 frequencies superpose
fbeat=∣f2−f1∣f_{\text{beat}} = |f_2 - f_1|fbeat=∣f2−f1∣
Frequency difference < ~20 Hz20 \text{ Hz}20 Hz
Beat frequency decreases as instruments reach same pitch
Change in observed frequency from relative motion
Frequency increases (higher pitch)
Frequency decreases (lower pitch)
f′=f(v+vo)(v−vs)f' = f\frac{(v + v_o)}{(v - v_s)}f′=f(v−vs)(v+vo)
340 m⋅s−1340 \text{ m}\cdot\text{s}^{-1}340 m⋅s−1 at room temp
Shock wave when source moves faster than sound
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