In order to distinguish between 2 sounds , a time interval at least what second is required?
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The second heart sound is of shorter duration and higher frequency than the first heart sound. It has two audible components, the aortic closure sound (A2) and the pulmonic closure sound (P2), which must be separated by more than 20 msec (0.20 sec) in order to be differentiated and heard as two distinct sounds.
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1/10 seconds difference between two sounds.
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