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A speaker emits a sound with power 0.2 mW. At what
distance is the intensity level of the sound 12.0 dB?
1000 m
2.5 m
100 m
25.0 m
A sound in air has a frequency of 400 Hz. What is the
wavelength of the sound wave? (Assume a speed of sound
340 m/s)
0.40 m
0.85 m
0.34 m
0.49 m

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