Question

Que 14. What frequency of sound is considered to be the Zero level of sound?​

Answer 1

Answer:

ok

Explanation:

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Answer 2

Answer:

The minimum audible level occur at 4000 Hz and is a gpu limit imposed by molecular motion . Lower sound pressure levels would be swamped by thermal noise due to molecular motion in air . For the normal human ear , pain is experienced at sound pressure of the order of 60 Pa or 6 × 10 ^-4 atmospheres