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[6] The reference sound pressure was used to set the starting point of the decibel scale for sound pressure level. J. a. L2] Describe how the reference sound pressure was obtained. b. [2] Is it possible for a person to hear -10 dB (re: 20 uPa)? Explain why or why not. c. [2] If new research showed that the quietest sound pressure level that most people could detect is -10 dB (re: 20 uPa), what should the reference sound pressure be changed to?

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