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 ...
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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 ...
Ice floats in water, but sinks in alcohol because ice is lighter than water and heavier than alcohol. This buoyancy phenomenon occurs due to differences in density. Ice has a lower density than water but a higher density than alcohol.
The historical tower of Pisa does not fall even though it is tilted because the vertical line passing through its center of gravity passes through the base. This alignment helps stabilize the tower and prevent it from collapsing despite its ...
A person climbing a hill leans forward to increase stability. Leaning forward shifts the center of mass towards the hillside, improving balance and reducing the risk of falling backward. This position also allows for better utilization of leg muscles and ...
If a person pushes a wall but fails to displace it, then he does no work. Work is defined as the product of force and displacement in the direction of the force. Since there is no displacement, no work is ...