2-5: 1 SEE ANSWER

Answer: C (a violinist playing a duet with the piano with her G string 5 cents sharp).

This is the only case where beats would be produced. While the trumpeter is playing 10 cents off from perfect pitch, no one else is playing with him in order to hear the two pitches go through interference. While the clarinet players are 10 cents off from perfect pitch they are both equally off, which means their frequencies are still the same resulting in superposition rather than beats. However, the violinist is playing at a different frequency than the piano, meaning that beats will occur when the two waves go through interference.

1. REDIRECT 2-5 Beats