1. A piano tuner hears a beat frequency when using a tuning fork to tune a piano wire. The piano tuner should adjust the tension in the wire to
A. Decrease the amount of interference and increase the beat frequency.❌
B. Increase the amount of interference and increase the beat frequency.❌
C. Decrease the amount of interference and decrease the beat frequency. ✅
D. Increase the amount of interference and decrease the beat frequency. ❌
2. In which case will a beat frequency most likely occur?
A. Two of the same instrument playing notes at the same frequency. ❌
B. Two different instruments playing notes at very different frequencies. ❌
C. Two different instruments playing notes at the same frequency. ❌
D. Two of the same instruments playing notes at slightly different frequencies. ✅
3. How can a person sing into a piano and cause a piano wire to vibrate?
A. The person sings at the same frequency as the piano wire, called the beat frequency. ❌
B. The person sings at a different frequency than the piano wire, called the beat frequency. ❌
C. The person sings at the same frequency as the piano wire, called the resonance frequency. ✅
D. The person sings at a different frequency than the piano wire, called the resonance frequency. ❌
4. What term is used to describe the combination of two traveling waves in the same material, which can be constructive or destructive depending on whether the waves meet in phase or out of phase?
A. Wavelength ❌
B. Interference ✅
C. Beat frequency ❌
D. Resonance frequency ❌
5. The wires in a piano vibrate, but fractions of the wire also vibrate at different frequencies than the whole wire. What is the term for the softer notes produced by these different frequencies?
A. Resonance ❌
B. Harmonics ✅
C. Pitch ❌
D. Interference ❌
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