Homework Help: college physics

Posted by genevieve on Wednesday, February 3, 2010 at 6:32pm.

A particularly beutiful note reaching your ear from a stradivarius violin has a wavelength of 39.1cm. The room is slightly warm, so the speed of sound is 344m/s. If the string's linear density is 0.670g/m and the tension is 140N, how long is the vibrating section of the violin string?

college physics - drwls, Wednesday, February 3, 2010 at 7:05pm
First calculate the frequency of vibration of the sound wave.

f = Vsound/(wavelength) = 880 Hz

(which would be an A note one octave above the standard A)

Next calculate the wavelength of the waves traveling on the violin string (if waves were traveling; actually there is a standing wave there). You need to know the wave speed on the string, which is sqrt(T/density) = sqrt(140/.000670) = 457 m/s

The wavelength on the string is
Vwave/f = 0.519 m = 51.9 cm.

Assuming this is a fundamental mode of the string, the length of the vibrating string is half a wavelength, or 26 cm.

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