31. The unit of noise pollution (level) is :
32. The speed of sound travel fastest through
33. Compressions and Rarefactions are characteristic of
34. Least audible sound for most of the human ear is :
35. Hertz is a unit for measuring
36. Hertz is the SI unit of
37. The velocity of the sound is highest in
38. The ordinary and maximum tolerance limit of sound by human being is
39. In SONAR which kind of wave is used?
40. Sound waves cannot travel through
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