الصوت والضوء: شدة الاستضاءة

The video tutorial introduces the concept of light intensity through a simple experiment. It demonstrates how light intensity decreases as the distance from the light source increases, illustrating the inverse square law. The experiment involves using a flashlight and a wall to observe changes in light spot size and intensity at varying distances. The tutorial concludes by defining light intensity as the amount of light falling perpendicularly on a unit area of a surface per second.

What tools are necessary to conduct the light intensity experiment?

• A mirror and a wall

• A flashlight and a wall

• A lens and a wall

• A prism and a wall

What happens to the light spot on the wall when you increase the distance from the light source?

• The spot becomes smaller and brighter

• The spot becomes larger and dimmer

• The spot remains the same size and brightness

• The spot disappears completely

What is the relationship between light intensity and distance according to the experiment?

• Directly proportional to the square of the distance

• Inversely proportional to the square of the distance

• Inversely proportional to the distance

• Directly proportional to the distance

What is the term used to describe the relationship between light intensity and distance?

• Inverse cube law

• Direct square law

• Direct cube law

• Inverse square law

How is light intensity defined in the context of this experiment?

• The amount of light reflected by the surface

• The amount of light falling perpendicularly on a unit area of the surface per second

• The amount of light absorbed by the surface

• The amount of light emitted by the source