if the time taken by the sound to return to a is 4.5 times – Discussion Forum

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Kriti

Asked: October 14, 2026In: Class 9 Science

Two identical sound sources are placed at A and B—one in air and one submerged in water (Fig. 10.34). Both produce sounds at the same time, which travel horizontally to the vertical side of the cliff and come back. If the time taken by the sound to return to A is 4.5 times than that of B, what is the ratio between the speeds of sound in air and water?

Since both sound waves travel the same round-trip distance, speed is inversely proportional to time. Taking the ratio of time taken gives the speed ratio of air to water as 1:4.5 or 2:9. Class 9 Science Exploration Chapter 10 Important Questions ...