A sound wave of frequency 1231 Hz travels through air directly toward a wall, then through the

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A sound wave of frequency 1231 Hz travels through air directly toward a wall, then through the wall out into air again. If the initial speed of the sound wave is 341 m/s and its speed in the wall is 620 m/s, what are 

(a) The initial wavelength of the sound, 

(b) The wavelength of the sound in the wall, and 

(c) The wavelength of the sound when it exits the wall on the other side?


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