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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
Sagot :
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