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26. A hearing test gradually raises the noise a listener is subjected to. If the test starts with an intensity of 10-14 W -, and

26. A hearing test gradually raises the noise a listener is subjected to. If the test starts with an intensity of 10-14 W -, and the intensity is increased by 15% every 20 seconds, what will the instantaneous rate of change m be, in dB per minute, when the dB level reaches the level of a whisper, 30dB?

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