31. In any medium, the speed of sound increases, as we increase . . . . . . . .
32. A sound source sends a wave of 600 Hertz. This produces a wavelength of 3 m. Speed of sound wave in this question is . . . . . . . .
33. Which of the following is the unit of perceived loudness of sound?
34. For humans, the audible waves are those that:
35. If the distance between a crest and its consecutive trough for a sound wave is L, then its wavelength is given by
36. Velocity of sound in air
1. Decreases with temperature
2. Increases with temperature
3. Increases with pressure
4. Is independent of pressure
which of the above the true?
1. Decreases with temperature
2. Increases with temperature
3. Increases with pressure
4. Is independent of pressure
which of the above the true?
37. Velocity of sound in air does not change with the change of
38. The frequency of a sound wave is 50 Hz and its wavelength is 4 meters. What is the speed of sound wave?
39. A person standing on a railway platform listens to the whistles of arriving and departing trains. The whistle heard is
40. Which one of the following is the effect of the flight of supersonic jet?
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