الصوت والضوء: قانون التربيع العكسي في الضوء

The video tutorial explains the inverse square law in light, stating that illumination intensity is inversely proportional to the square of the distance from the light source. It highlights two main factors affecting illumination: the light source's power and the distance from the surface. The tutorial demonstrates how changing the distance impacts illumination, showing that doubling the distance reduces intensity to a quarter, halving the distance increases it fourfold, and tripling the distance reduces it to a ninth.

What does the inverse square law in light state about illumination intensity?

• It is directly proportional to the distance from the light source.

• It is inversely proportional to the square of the distance from the light source.

• It is directly proportional to the square of the distance from the light source.

• It is inversely proportional to the distance from the light source.

Which factor is directly proportional to the illumination intensity on a surface?

• The color of the light source

• The strength of the light source

• The angle of the light source

• The distance from the light source

What happens to the illumination intensity if the distance between the surface and the light source is doubled?

• It reduces to a quarter.

• It doubles.

• It remains the same.

• It increases fourfold.

If the distance between the surface and the light source is halved, what is the effect on illumination intensity?

• It increases fourfold.

• It reduces to half.

• It reduces to a quarter.

• It remains unchanged.

When the distance between the surface and the light source is tripled, what happens to the illumination intensity?

• It reduces to a ninth.

• It reduces to a third.

• It remains the same.

• It triples.