Light

The video explores the nature of light, describing it as a narrow band of electromagnetic radiation visible to the human eye. It explains how light interacts with objects, creating colors, and how prisms can separate light into its spectrum. The electromagnetic spectrum is discussed, highlighting the relationship between frequency and wavelength. The video also covers human perception of light, the role of the eye and brain, and how optical illusions can trick our perception. Finally, it examines different types of light bulbs, including incandescent, fluorescent, and LED, discussing their efficiency and technological advancements.

What is the range of wavelengths for visible light?

• 600 to 900 nanometers

• 400 to 700 nanometers

• 100 to 300 nanometers

• 200 to 500 nanometers

How does a prism separate white light into different colors?

• By reflection

• By absorption

• By refraction

• By diffraction

What happens to the wavelength of a wave if its frequency increases?

• The wavelength increases

• The wavelength decreases

• The wavelength doubles

• The wavelength remains the same

Which part of the electromagnetic spectrum can humans not see?

• Visible light

• Ultraviolet light

• Both ultraviolet and infrared light

• Infrared light

What cells in the human eye are responsible for detecting light?

• Pupils and lenses

• Cones and rods

• Neurons and axons

• Fibers and tissues

What is a major disadvantage of incandescent light bulbs?

• They are too bright

• They are too expensive

• They emit harmful radiation

• They produce too much heat

What is the main advantage of LED lights over incandescent bulbs?

• They produce more heat

• They are more energy-efficient

• They are cheaper

• They emit light in all directions