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Beyoncé Knowles was enrolled in voice therapy for a problem with a breathy voice. Following voice...

Beyoncé Knowles was enrolled in voice therapy for a problem with a breathy voice. Following voice therapy, her average sound pressure for singing increased from 2.5 x 102 µPa to 4.5 x 103 µPa. What was the increase in Beyoncé’s vocal output in dB?

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