Suppose you blow the top of a bottle and hear a resonance, Ask an Expert

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Suppose you blow the top of a bottle and hear a resonance sound (standing wave). The length of the bottle is about 25cm. If the speed of sound in air is about 340 cm/sec., what is the frequency of the sound you hear? Draw a diagram to show the standing wave in the bottle.

Speed = frequency .wavelength

Frequency = speed/wavelength

Speed = 340 m/sec length = 25cm

Wavelength can be determined by knowing the length and the number of harmonics.Here,we take first harmonic which would be four times the length ,so

Wavelength = number of harmonics X L

Frequency = speed/wavelength

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