Vibration in Air Columns (HSC SSCE Physics): Flashcards

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Vibration in Air Columns
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Two types of pipes for standing sound waves

Open pipes (both ends open) and closed pipes (one end closed)

How compression reflects at open pipe end

Reflects as rarefaction

How compression reflects at closed pipe end

Reflects as compression

Type of displacement point at open end

Displacement antinode

Which harmonics do open pipes support?

All harmonics (all integer multiples)

Which harmonics do closed pipes support?

Only odd harmonics (1st, 3rd, 5th, etc.)

Fundamental frequency formula for open pipe

f1=v2lf_1 = \frac{v}{2l}

Fundamental frequency formula for closed pipe

f1=v4lf_1 = \frac{v}{4l}

Closed pipe fundamental vs open pipe (same length)

Half the frequency of open pipe

Effect of temperature on speed of sound

Speed of sound increases with temperature

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