The working system of radar is based on reflection of radio waves. Radar (Radio Detection and Ranging) uses radio waves transmitted from an antenna. These waves are directed towards an object, and some of them reflect back to the radar ...
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To hear a clear echo, there should be a minimum distance between the reflecting plane and the sound source of 17 meters. This distance ensures that the time delay between the original sound and its reflected sound is perceptible to ...
The cause of echo is reflection of sound. When sound waves encounter a smooth and hard surface, such as a wall or cliff, they bounce back towards the source. If the reflected sound reaches the listener’s ears distinctively after the ...
The decibel unit is used for the intensity of sound. It quantifies the level of sound intensity based on a logarithmic scale, where each increase of 10 decibels represents a tenfold increase in intensity. This unit helps measure and compare ...
While shouting, a person keeps the palm near the mouth because in that position, the sound energy will point in one direction only. This helps to direct the sound waves forward, increasing their intensity and focusing them toward the intended ...