The technique or method used to absorb undesirable sounds by soft and porous surface is called:

A ) ultrasonics

B ) acoustic protection ✅

C ) infrasonics

D ) echo

Related Questions
  1. The speed of sound in a liquid is ____ than that in gases:
  2. The main categories of waves are:
  3. Sound waves having frequency higher than 20,000 Hz are called:
  4. The pitch of a sound is most closely related to its:
  5. We can distinguish between the notes of a piano and flute due to ___of sound.
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