What is Light? - Light Energy

The video tutorial explores light as a form of energy, focusing on visible light within the electromagnetic spectrum. It explains how light waves travel through space, the concepts of luminance and illuminance, and the role of light reflection in vision. The tutorial highlights the importance of light in our lives, both natural and artificial, and its vital role in sustaining life on Earth.

What part of the electromagnetic spectrum can humans naturally see?

• Infrared light

• X-rays

• Visible light

• Ultraviolet light

How does light travel from the sun to Earth?

• Through air molecules

• Through a vacuum

• Through solid objects

• Through water

What happens to light waves as they move away from their source?

• They become more concentrated

• They increase in speed

• They spread out and become less concentrated

• They change color

What is the role of light waves in vision?

• They are absorbed by objects

• They are emitted by the eyes

• They are invisible to the eyes

• They reflect off surfaces and enter the eyes

Why is light considered vital for life on Earth?

• It is a source of energy

• It is used for communication

• It provides warmth

• It creates sound