51. Two waves, each of amplitude 1.5 mm and frequency 10 Hz, are travelling in opposite direction with a speed of 20 mmls. The distance in mm between adjacent nodes is
52. Which is the incorrect statement with regard to ultrasound waves?
53. Sound waves
54. The speed of sound is faster in
55. Fill in the blank with the most appropriate option.
Pitch of sound depends on . . . . . . . .
Pitch of sound depends on . . . . . . . .
56. Which one of the following units is used for measurement of noise pollution?
57. What is the repetition of sound, produced by the reflection of sound waves?
58. A sound wave produced at wavelength 2.5m, its frequency is 400 Hz. Find the velocity of wave.
59. Which of the following is not a quality of sound waves?
60. Sound wave is not characterized-
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