4000 Hz clean pure sine wave TEST TONE 4 khz frequency - YouTube
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4000 Hz Sound Audio Test Tone | 4000 Hertz Sine Signal | 4 kHz - YouTube
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4000 Hz Test Tone - YouTube
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SOLVED:(a) What is the intensity in watts per meter squared of a just barely audible 200-Hz sound? (b) What is the intensity in watts per meter squared of a barely audible 4000-Hz
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4000 Hz Test Tone 10 Hours - YouTube
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4000 Hz 4 kHz Sine Wave Sound Frequency Tone - YouTube
4000 Hz Test Tone - YouTube
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