

Questions from inside the book
Questions from inside the book
Last updated at Dec. 16, 2024 by Teachoo
Question 1 Page 168 An echo is heard in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 m sā1? Speed of sound = v = 342 m/s Time taken for hearing the echo = t = 3 s Let the total distance travelled by the sound = 2d Distance of the reflecting surface from the source = Total distance / 2 = 2d/2 = d Now, Speed of sound = (š·šš š”šššš š”ššš£ššššš šš¦ š šš¢šš)/(šššš ššššš) v = 2š/š” v Ć t = 2d 2d = v Ć t d = (š£ Ć š”)/2 d = (342 Ć 3)/2 d = 171 Ć 3 d = 513 m Distance between reflecting surface and source is 513 m