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Yawning increases pressure in eustachian tube because it takes place during inspiratory phase of respiration, so pushes Ear drum on the outer side


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Short answer Hearing threshold is 0 dB SPL at 1 kHz, and pain threshold is around 125 dB SPL at that frequency. Background Loudness thresholds depend on acoustic frequency (pitch), as depicted in the following figure: Loudness contours in human. Source: Stanford Uni When expressed in dB sound pressure level (dB SPL) the threshold of pain is approximately ...



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