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You hear a sound with a certain frequency. The amplitude of the sound increases and decreases periodically. It takes 2 seconds for the sound to go from loud to soft and back to loud. This sound can be thought of as a sum of two waves with frequencies A. 254 Hz and 258 Hz B. 255 Hz and 257 Hz C. 255.5 Hz and 256.5 Hz D. 255.75 Hz and 256.25 Hz
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