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), ...
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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 ...
The gravitational force acting on a stone of mass m falling under gravity is F = mg.
The magnitude of the gravitational force F on a falling object is calculated by multiplying its mass m by the acceleration due to gravity g, expressed as F = mg.
The acceleration involved in falling objects due to gravity is called the acceleration due to gravity, denoted by g.