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The simulation assumes that the speed of sound is fixed, so the speed of each moving circle is always the same. Reset the simulation, increase

The simulation assumes that the speed of sound is fixed, so the speed of each moving circle is always the same. Reset the simulation, increase the frequency of the sound to 2.0 Hz, and start it again. What happens to the emitted waves? The wavelength decreases. The wavelength increases. The waves move slower. The waves move faster

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