The Nature of Light: Light Speed and Intensity

The video tutorial explains how light intensity decreases with distance, using a spray paint analogy. It discusses the speed of light, which varies in different mediums, and introduces the concept of a lightyear, a unit of distance used in astronomy. The tutorial highlights that light from stars can be hundreds or thousands of years old due to the vast distances in space.

What happens to the intensity of light as the distance from the light source increases?

• It increases.

• It remains the same.

• It decreases.

• It fluctuates randomly.

Which analogy is used to explain the concept of light intensity in the video?

• A flashlight

• A prism

• A spray paint can

• A magnifying glass

How does the speed of light change when it passes through water or glass?

• It doubles.

• It increases by 30%.

• It decreases by nearly 30%.

• It remains constant.

What is the speed of light in space?

• 600,000 kilometers per second

• 450,000 kilometers per second

• 300,000 kilometers per second

• 150,000 kilometers per second

What does a lightyear measure?

• The speed of light in a vacuum

• The brightness of a star

• The distance light travels in one year

• The time it takes for light to travel from the Sun to Earth