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InamiK
InamiK asked in Science & MathematicsPhysics · 4 years ago

Sound in physics?

You are standing 100 meters from an object emitting a sound of constant intensity (loudness). You walk toward the source of sound until you are 20 meters from it. From your perspective, what has happened to the intensity of the sound?

It has decreased by a factor of five.

It has increased by a factor of five.

It has decreased by a factor of twenty-five.

It has increased by a factor of twenty-five.

2 Answers

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  • Jim
    Lv 7
    4 years ago

    It will increase as the square of the distance.

    100^2/20^2 = 10000/400 = 25

    It will be 25 times louder.

  • Randy P
    Lv 7
    4 years ago

    Intensity is proportional to 1/r^2.

    The new distance is 1/5 of the old distance. So the intensity changes by 1/(1/5)^2

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