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...but if it's something everyone can hear, he won't hear it any sooner.
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How come, if the sound source in question radiates into water and air both, and soundwaves are known to travel faster through liquids & solids than gases? Enquiring buggers with tiny minds want to know
PS / EDIT: Got it. Within typical hydrophone detection ranges the delay between the two is so short that it's not detectable by ear, right? AFAIR the shortest delay the human ear / brain combo decodes as an aural delay is some 20-30 milliseconds, and anything less than that is heard as a phase shift / comb filter effect... am I right?