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November 24, 2014

Homework Help: physics

Posted by Student in Need on Thursday, March 31, 2011 at 1:33pm.

Given the information which statements are true or false?
We know that when we pluck a string on an instrument the resulting sound wave travels through the air at a speed of (about) 344 m/s. But the wave moving on the STRING itself doesn't have to travel at 344 m/s. Let's consider some of the things that affect the velocity of a standing wave on a string.

A) The velocity of a wave traveling on a guitar string is increased if you exchange the string for one that is denser (keeping the length and tension unchanged.)
B) The velocity of the wave traveling on a string is higher if you pluck the string with a slightly larger sideways force
C) Given that waves travel on a guitar string with speed less than the speed of sound in air, and that a guitar string vibrates with frequency f: (T or F) the fundamental frequency of sound waves produced by this guitar will be equal to f.
D) Given that waves travel on a mandolin string with speed less than the speed of sound in air, and that a mandolin string vibrates with a wavelength lambda: (T or F) the resulting sound wave produced in the air will have a wavelength longer than lambda.
E) The velocity of the wave traveling on a string stays the same if you increase the length of the string (keeping the type of string, and the tension of the string, unchanged)

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