To hear an echo distinctly, the time interval between the original sound and the echo should be more than 1/10 seconds. This time delay allows the reflected sound waves to travel a sufficient distance before reaching the listener’s ears, ensuring ...
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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 ...
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 ...
The process that does not occur in both light and sound is Polarization. Polarization is a phenomenon where waves oscillate in a specific direction perpendicular to their direction of propagation. While light waves can be polarized, sound waves are longitudinal ...
Two people cannot hear each other on the surface of the Moon because there is no atmosphere on the Moon. Sound waves require a medium, such as air or water, to travel and be heard. The Moon’s lack of atmosphere ...
The phenomenon where the sound of a whistle increases as a train approaches and decreases as it moves away is an example of Doppler effect. It occurs due to the relative motion between the source (train) and the observer (listener), ...
The source that causes the most noise pollution among the options provided is Airplane taking off. Aircraft taking off produce extremely high decibel levels, affecting large areas around airports. This surpasses the noise generated by motor vehicles, railway engines, and ...