31. The technique used to transmit audio signals in television broadcast is
32. Sound is a form of . . . . . . . . that produces sensation of heating.
33. Speed of sound at 0° C in air will be:
34. Consider the following statements.
1. In sound waves, the vibrations are perpendicular to the direction in which the wave travels.
2. Sound waves are elastic waves.
Which of the statement(s) given above is/are correct?
1. In sound waves, the vibrations are perpendicular to the direction in which the wave travels.
2. Sound waves are elastic waves.
Which of the statement(s) given above is/are correct?
35. A sound wave has a frequency of 4 kH2 and a wavelength of 40 cm. The time taken by a sound wave to cover a distance of 3.2km is-
36. Noise pollution is created if noise is in excess to
37. Calculate the wavelength of a sound wave that has a frequency of 200 Hz and its speed in a given medium is 400 ms-1.
38. The velocity of sound in air is approximately
39. A boat at anchor is rocked by waves whose consecutive crests are 100 m apart. The velocity of the wave of the moving crests is 25 ms-1. What is the frequency of the rocking of the boat?
40. The amount of sound energy passing in the unit area per second is called-
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