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* Tovi is playing a flute and Dawn is playing a violin. At the beginning of the performance, they tuned their instruments by ear, so the difference between the fundamental frequencies of the A notes played on each instrument was less than 1 Hz. At the end of the performance, they measured the A note fundamental frequencies of their instruments using a device that measures sound frequency with uncertainty 0.05 Hz. Dawn’s A was 442.6 Hz and Tovi's was 439.3 Hz. (a) Can you say for sure that the A note frequency of at least one musical instrument changed during the performance? (b) Can you say for sure that the A note frequency of both musical instruments changed during the performance? (c) What do Dawn and Tovi hear when they simultaneously play the A note at the end of the performance? Give a quantitative description.
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