Question

15. What is reverberation? How can it be reduced?
16. What is loudness of sound? What factors does it depend on?
17. Explain how bats use ultrasound to catch a prey.
18. How is ultrasound used for cleaning?
19. Explain the working and application of a sonar.
20. A sonar device on a submarine sends out a signal and receives
an echo 5 s later. Calculate the speed of sound in water if the
distance of the object from the submarine is 3625 m.
21. Explain how defects in a metal block can be detected using
ultrasound.
22. Explain how the human ear works.​

Answer 1

Answer:

15. reverberation is the repeated multiple reflection of sound in any big enclosed space