Class 9 ct sound

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 1. A bat emits ultrasonic sound of frequency 40,000 Hz. If wavelength is 0.0085 m, calculate the speed of sound used by the bat.

2. A person stands between two tall mountains and fires a starter pistol. They hear the first echo after 2 seconds and the second echo after 3 seconds. If the speed of sound is 340 m/s, what is the total distance between the two mountains?

3. In a longitudinal sound wave travelling through air, the distance between a compression and the nearest rarefaction is 0.85 m. The time period of the wave is 0.01 s. The amplitude of vibration is 4 mm. What is the speed of the sound wave?