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Kriti
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Asked: 2026-10-14T05:54:49+00:00 In:

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?

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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 from Sound Waves
SQP from Class 9 Science Chapter 10 Sound Waves Characteristics and Applications

class 9 science exploration chapter 10 sound waves (new book)class 9 science exploration chapter 10 sound waves solutionsidentical sound sources are placed at a and bif the time taken by the sound to return to a is 4.5 timesratio between the speeds of sound in air and watersound waves: characteristics and applications question answer
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    1. Both sound waves cover the identical distance to the vertical cliff and back. Because wave speed equals distance divided by time, speed is inversely proportional to the transit time. Since the time taken in air is 4.5 times that in water, the ratio of the speed of sound in air to that in water is 1 to 4.5, which simplifies to 2:9 (or roughly 0.22).

       

      For more NCERT Solutions of Class 9 Science Exploration Chapter 10 Sound Waves Characteristics and Applications Question Answer (2026-27)

      https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-10/

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