Explanation The frequency must stay the same because the media is continuous - the end of one section of cord is physically tied to the other section of cord. If the end of the first section of cord is vibrating up and down with a given frequency, then since it is attached to the other section of cord, the other section must vibrate at the same frequency. If the two pieces of cord did not move at the same frequency, they would not stay connected, and then the waves would not pass from one section to another. The wavelength and velocity of a wave are functions of the medium, in this case the rope. A sigmoidal wave can be thought of as a series of forces acting on the rope perpendicular to its length, and the force is constantly reversing direction (probably as a consequence of someone's hand whipping one end of the rope back and forth)...

7th Edition

ISBN: 9780321625915

Author: Douglas C. Giancoli

Publisher: PEARSON

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Chapter 11, Problem 20Q

To determine

why the frequency does not change (although the wavelength and velocity do change)when a sinusoidal wave crosses the boundary between two sections of cord.

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Chapter 11, Problem 19Q

Chapter 11, Problem 21Q

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