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4)) 21% D Mon 3:27 PM QA E Chrome File Edit View History Bookmarks People Window Help Mastering Physics: HW 03: Wave Motion Superposition and Interference Secure https session. masteringphysics.co 73625658 PHYS 213 SP2017 ying-686 HW 03: Wave Motion -Superposition an Item 3 Resources The Heads of New... Apps previous l 3 of 12 l next Item 3 Part A The nodes of a standing wave are points at which Which one of the following statements about such a wave as described in the problem introduction is the displacement of the wave is zero at all times. correct? Nodes are important for matching boundary conditions, for example, that the point at which a O This wave is traveling in the +z direction. string is tied to a support has zero displacement at all times e., the point of attachment does not O This wave is traveling in the z direction. move) Consider a standing wave, where y nepresents the O This wave is oscillating but not traveling. transverse displacement of a string that extends along the x direction. Here is a common O This wave is traveling but not oscillating. mathematical form for such a wave: y(z, t Asin (ka) sin(wt), Submit My Answers Give Up where A is the maximum transverse displacement of the string (the amplitude of the wave), which is assumed to be nonzero, k is the wave number, w Part B is the angular frequency of the wave, and t is time. At time t 0, what is the displacement of the string y(z,0)? Express your answer in terms of A, k, and other previously introduced quantities. y(z,0 Submit My Answers Give Up Correct

Explanation / Answer

part A:

This wave is oscillating but not traveling......ans

because ------Each part of the string oscillates with the same phase, so the wave does not appear to move left or right; rather, it oscillates up and down only.

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