An incident wave d20 cm sin 45x-18t where x and t are in, Ask an Expert

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An incident wave D=(2.0 cm) sin (4.5x-18t) (where x and t are in meters and seconds ) travels down a cord from a section with linear density 0.30 kg/m to one with density 0.10 kg/m. When the wave travels into the lighter density region, its wavelength becomes

a) 0.81m

b) 1.4m

c) 1.7m

d) 2.4m

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