GK
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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directly proportional to
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inversely proportional to
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directly proportional to square of
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inversely proportional to square of
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Detailed explanation-1: -This principle is known as the inverse square law: intensity is inversely proportional to the square of the distance from the source (I ∝ 1/d2). Our subjective sense of a sound’s “loudness” is not the same as its intensity, but is generally roughly proportional to it.
Detailed explanation-2: -We can see from the equation that the intensity of a sound is proportional to its amplitude squared. The pressure variation is proportional to the amplitude of the oscillation, and so I varies as (p)2.
Detailed explanation-3: -Sound from a point source obeys the inverse square law. It’s intensity in decibels can be calculated by comparing the intensity to the threshold of hearing. the sound intensity is x10^ watts/m2 = dB.
Detailed explanation-4: -Because work W is related to force multiplied by distance (Fx) and energy is put into the wave by the work done to create it, the energy in a wave is related to amplitude. In fact, a wave’s energy is directly proportional to its amplitude squared because W ∝ Fx = kx2.