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For sound intensity (acoustic intensity) we use in the free field (direct field) the inverse square law = 1/r². I1 and r1 belong to the close distance and I2 and r2 belong to the far distance.

I2 = I1 * (r1/r2)²

I2 = I1 * (1/3)² = I1 / 9

Three times farther away gives one ninth the sound intensity of the close sound intensity.

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If the distance from the light source is tripled how much does the light intensity change?

The light intensity decreases by a factor of nine when the distance from the light source is tripled. This relationship is governed by the inverse square law, which states that the intensity of light is inversely proportional to the square of the distance from the source.


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The electric force between two positive charges will decrease by a factor of 9 (inverse square law) when the distance between the charges is tripled.


How is the intensity of light and distance related?

The intensity of light decreases as distance from the source increases. This relationship follows an inverse square law, meaning that if you double the distance from the source of light, the intensity decreases by a factor of four.


What happens to the light intensity if you half the distance to the source?

The light intensity increases by a factor of four when you half the distance to the source. This is known as the inverse square law, where light intensity is inversely proportional to the square of the distance from the source.

Related Questions

If the distance from the light source is tripled how much does the light intensity change?

The light intensity decreases by a factor of nine when the distance from the light source is tripled. This relationship is governed by the inverse square law, which states that the intensity of light is inversely proportional to the square of the distance from the source.


How does the intensity of a sound wave change if the distance from the source increases by a factor of 2?

The intensity increases by a factor of 4-APEX


How does the intensity of a sound wave change if the distance from the source is reduced by a factor of 3?

The intensity of a sound wave would increase by a factor of 9 (3^2) if the distance from the source is reduced by a factor of 3. This is because intensity is inversely proportional to the square of the distance from the source.


How does the electric force change between two positive charges when the distance between the charges is tripled?

The electric force between two positive charges will decrease by a factor of 9 (inverse square law) when the distance between the charges is tripled.


How does the intensity of a sound wave change if the distance from the source is reduced by a factor of 4?

- 6 dB is incorrect. It will decrease by 12 dB.


What will happen to the force of gravity if the mass of one of the objects is tripled?

You didn't specify what force. some forces have an inverse-square relationship. That is to say, the force of gravity, or electrostatic attraction or repulsion, is inversely proportional to the square of the distance - if the distance is tripled, the force is reduced by a factor of 9.You didn't specify what force. some forces have an inverse-square relationship. That is to say, the force of gravity, or electrostatic attraction or repulsion, is inversely proportional to the square of the distance - if the distance is tripled, the force is reduced by a factor of 9.You didn't specify what force. some forces have an inverse-square relationship. That is to say, the force of gravity, or electrostatic attraction or repulsion, is inversely proportional to the square of the distance - if the distance is tripled, the force is reduced by a factor of 9.You didn't specify what force. some forces have an inverse-square relationship. That is to say, the force of gravity, or electrostatic attraction or repulsion, is inversely proportional to the square of the distance - if the distance is tripled, the force is reduced by a factor of 9.


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If the radius is tripled then the Area will be greater by a factor of 9. And the circumference will be greater by a factor of 3.


How is the intensity of light and distance related?

The intensity of light decreases as distance from the source increases. This relationship follows an inverse square law, meaning that if you double the distance from the source of light, the intensity decreases by a factor of four.


What happens to the light intensity if you half the distance to the source?

The light intensity increases by a factor of four when you half the distance to the source. This is known as the inverse square law, where light intensity is inversely proportional to the square of the distance from the source.


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For example, assume you are shining a flashlight at the wall. If you move twice as far from the wall, the spot of light will be twice the diameter. If the diameter doubles, then the area of the spot is 4 times as big. Thus, the same light is lighting 4 times as much wall. Thus, the intensity is 1/4 of the original intensity. The intensity varies with the inverse of the square of the distance.