81. Echolocation is an adaptation bats use to
82. Bats can sense obstacles because they produce
83. A wavelength of 0.3 m is produced in air and it travels at a speed of 300 m/s. Then it will be an
84. Which term is not associated with sound wave?
85. Velocity of sound in air does not depend on
86. Speed of sound in air is unaffected by change in
87. RADAR is used for
88. What is the minimum distance (in metres) required to hear an echo?
89. Sound travels fastest in
90. Which among the following determines the pitch of a sound?
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