Question: (a) What is the medium displacement at a point halfway between a filled circle and a neighboring open circle in Figure 17.14 b? (b) Sketch

(a) What is the medium displacement at a point halfway between a filled circle and a neighboring open circle in Figure 17.14 b?

(b) Sketch the variation of this displacement as a function of time.

(c) What is the medium displacement at all points between two neighboring half-filled circles?

(d) Sketch the variation of this displacement as a function of time at the midpoint between two neighboring half-filled circles.

Figure  17.14

(a) ( crests troughs (b) nodal line antinodal line Watch this point:

(a) ( crests troughs (b) nodal line antinodal line Watch this point: currently a point of maximum positive displacement. Watch this trough. Watch this crest. half a period later... (c) now a point of maximum negative displacement Crest and trough have moved outward by half a wavelength.

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