Question 15 — Two identical sound sources are - Questions at the end of the chapter - Chapter 10 - Sound Waves: Characteristics and Application (Exploration

Last updated at July 20, 2026 by

Question 15
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?
View Answer Hide Answer
  • Same distance, so time is inversely proportional to speed: t A t B = v B v A =4.5 .
  • Hence v air v water = v A v B = 1 4.5 ≈ 1:4.5 (sound is faster in water).
Ratio of Speeds Same distance, so time is inverse of speed t_A / t_B = v_B / v_A = 4.5 v_air to v_water is about 1 to 4.5
Back to: 10.6.3 Speed of Sound
Remove Ads
Teachoo · Class 9 Explore Class 9
Maninder Singh's photo - Co-founder, Teachoo

Made by

Maninder Singh

CA Maninder Singh is a Chartered Accountant with 16+ years of practical experience and 20+ years of teaching experience. He teaches Science, Economics, Accounting and English at Teachoo using clear explanations and exam-focused methods students can trust.

For faster and distraction-free study, students can choose Teachoo Black.