71. What is the standard unit for measuring the frequency of a sound wave?
72. Oscillatory motion is that motion
73. What is called the sound wave above than frequencies of 30,000 Hz?
74. The bats can fly in the dark because they
75. Which one of the following phenomena cannot be exhibited by sound waves?
76. In . . . . . . . . speed of sound is the fastest.
77. The propagation of sound waves in a gas involves
78. Sound intensity is measured-
79. What is the minimum distance (in metres) required to hear an echo?
80. What is the frequency of Infrasonic waves?
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