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 ...
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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 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 ...
Sound travels fastest through Steel. Steel has a higher density and elasticity compared to other substances listed, allowing sound waves to propagate faster. This property makes steel an excellent conductor of sound in industrial and structural applications.
Bats can fly in the dark because they produce very intense sound waves which control it. Bats use echolocation, emitting high-frequency sound waves and interpreting the echoes to navigate and locate prey in darkness. This biological adaptation allows them to ...