91. More density of the particles in the medium through which sound travels, creates more . . . . . . . . and vice versa.
92. A source of wave produces 20 crests and 20 troughs in 0.4 seconds. Find the frequency of the wave:
93. The time period of a simple pendulum made by using a thin copper wire of length L is T. Suppose the temperature of the room in which this simple pendulum is placed increases by 30°C. What will be the effect on the time period of the pendulum?
94. What is the approximate value of speed of sound in air?
95. Which of the following statements is correct about sound waves and light waves?
96. Which one of the following statements is correct? The velocity of sound
97. There is an acoustic resonance, which echoes is the fixed resonance when it is in vibration.
98. What are the main instruments in a SONAR, which are used to find the distance, direction and speed of an underwater body?
99. Which one of the following is not true for an electromagnetic wave?
100. The speed of sound . . . . . . . . as it passes from solid to gaseous medium?
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