71. Man cannot tolerate very high sound, what is the highest sound level that human cannot hear-
72. Sound waves travel on following-
73. Sound waves do not travel in
74. Doppler shift in frequency does not depend upon
75. The acronym SONAR stands for:
76. The quality or tone of a musical sound produced by a stringed instrument depends on
77. The time taken for one oscillation at a point in the medium is called.
78. What waves cannot be transmitted through vacuum?
79. What is called the area of high density of particles in the medium during transmission of sound?
80. If a wave completes 40 vibration in 2.5 seconds, then its frequency is:
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