Q. Working of radars in oceans is based on the principle ofĪnswer: B. You can download Sound Sheet by clicking on the download button below This value can be calculated and comes out to be 17.2 m for air and 70 m for water.Whenever echo is to be heard the time between two objects or body or points should be 0.1 sec. Otherwise, the echo is not distinguished even on reaching the ears. This is an echo. An echo is heard when the distance between the person producing sound and the rigid obstacle is long enough to allow the reflected sound to reach the person least 0.1 seconds after the original sound is heard. Suppose you are standing in front of a high wall and clap your hand, you can hear the same sound of the clap back again. When we shout in a large or vacant space, the sound is reflected back. If we want to hear an echo, we cannot do it in a small room, we need a large area. Thus the echo is the result of reflection. Echo is basically a sound heard after the sound is reflected back when the actual sound has stopped. EchoĮvery one must have heard of the word echo. Here the speed of the sound energy is the slowest. In liquids, the particles are at a distance, so it takes more time to travel. Sound energy moves as one particle hit another particle. In solids, the particles are very close to the other one. How does the sound energy travel? Do you wonder how that works? Sound energy travels in the form of sound waves. Vibration is nothing but the back and forth movement of the object.
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