71. Why are we able to hear short wave broadcasts better than long wave broadcasts?
72. The depth of the trough of a wave is called its-
73. What are the roofs and walls of the auditorium covered to reduce echo?
74. What is the frequency of ultrasonic waves?
75. To hear distinct echo the time interval between the original sound and the reflected sound must be-
76. The maximum distance of the particle from the fixed point or mean position is called
77. TV remote control uses
78. When the sound passes through the air, the particles of air-
79. Through which of the following mediums can sound not travel?
80. What is the lowest frequency of sound that can be heard by human beings?
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