71. The velocity of sound is more in
72. Echo is heard due to
73. A person standing on a railway platform listens to the whistles of arriving and departing trains. The whistle heard is
74. The sound produced by a bat is–
75. Sound is heard over longer distances on rainy days because
76. Which phenomenon is responsible for the echo of sound wave?
77. Loudness of sound depends on
78. Which one of the following animals can hear ultrasonic sound ?
79. The instrument which uses sound waves to measure the depth of oceans is
80. Megahertz is a measurement of
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