Part A = 10 dB

Part B = 20 dB

Part C = 3,6,9 dB

What is the sound intensity level Β, in decibels, of a sound wave whose intensity is 10 times the reference intensity (i.e., I = 10I_{0})?

What is the sound intensity level Β, in decibels, of a sound wave whose intensity is 100 times the reference intensity (i.e., I = 100I_{0})?

Calculate the change in decibels (ΔΒ_{2}, ΔΒ_{4}, and ΔΒ_{8}) corresponding to f = 2, f = 4, and f = 8.

Part A = (B,F) < (A,C,E) < D (increasing order)

Part B = (C,D,F) < (A, B) < E (increasing order)

A combination work of art/musical instrument is illustrated. Six lengths of identical piano wire are hung from the same support, and masses are hung from the free end of each wire. Each wire is 1, 2, or 3 units long, and each supports 1, 2, or 4 units of mass. The mass of each wire is negligible compared to the total mass hanging from it. When a strong breeze blows, the wires vibrate and create an eerie sound.

Rank each wire-mass system on the basis of its fundamental wavelength.

Rank each wire-mass system on the basis of its wave speed.

Part A = all of the preceding

The speed of sound in air A. is about 1/3 km/s. B. is about 1/5 mi/s. C. depends on temperature. D. all of the preceding.

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A closed organ pipe has a fundamental frequency of 528 Hz (a C note) at 20° C. What is the fundamental frequency of the pipe when the temperature is 2° C?

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Two identical strings on different cellos are tuned to the 440 Hz A note. The peg holding one of the strings slips, so its tension is decreased by 1.9 %. What is the beat frequency heard when the strings are then played together?

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Part A = f_{o} = 426 Hz

Part B = f_{o} = 377 Hz

While standing near a railroad crossing, you hear a train horn. The frequency emitted by the horn is 400 Hz. If the train is traveling at 75 km/hr and the air temperature is 25 °C, what is the frequency you hear when the train is approaching you?

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