Sound is a kind of energy and it needs a medium to travel as it is a kind of longitudinal wave. The speed of sound in different medium is different. Along with the nature of the medium temperature also affects the speed of the sound. At 25ºC speed of sound in some medium is given below :
Air – 346 m/s
Water (Distilled) – 1498 m/s
Water (Sea) – 1531 m/s
Flint Glass – 3980 m/sSteel – 5960 m/s
Sound energy gets reflected through a suitable reflecting surface. An echo is a reflected sound which is heard separately. The sensation of sound persists in our brain for about 0.1sec. To hear the echo clearly at 22ºC, the minimum distance between the source of sound and obstacle should be 17.2 m as the speed of sound in air at that temperature is 344 m/s
An echo is returned in 3 sec. at 22°C in a hall. What will be thedistance of reflecting surface from the source
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travel as it is a kind of longitudinal wave. The speed of sound in different medium is different. Along with the nature of the medium temperature also affects the speed of the sound. At 25ºC speed of sound in some medium is given below :
Air – 346 m/s
Water (Distilled) – 1498 m/s
Water (Sea) – 1531 m/s
Flint Glass – 398
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