Waves and their Applications

What is the speed of light in a vacuum?

In which medium does light travel the slowest?

How is brightness related to the amplitude of a light wave?

What does a high amplitude of a light wave indicate?

Which material allows light to travel the fastest?

Which of the following is true about the speed of light in different media?

How can we express the speed of light in scientific notation?

What effect does increasing the amplitude of a light wave have?

Which statement correctly describes light traveling through different materials?

What is the relationship between light intensity and energy?

Waves and their Applications

Light is a type of electromagnetic (EM) wave.
The speed of EM waves in a vacuum is 300,000,000 m/s (or 3 x 10⁸ m/s).
EM waves travel more slowly through materials than in a vacuum.
Brightness of light is related to the amplitude of the light wave. Higher amplitude means brighter light, carrying more energy.
Different wavelengths of light (including UV) do not pass through the atmosphere equally. Most visible light and radio frequencies pass through.
The atmosphere blocks most higher-frequency EM waves, like UV light.
Small amounts of UV light are beneficial, producing vitamin D, helping the body absorb calcium for strong teeth and bones.
Excessive UV exposure can cause sunburn, wrinkles, eye damage, and skin cancer.
Protecting from excessive UV light is easily done with sunscreen (high SPF) or protective clothing.
Light travel slower in denser/thicker materials (like solid, liquid and gas)
Light travels faster in a vacuum compare to other mediums.

Day 1 Objectives

Identify the speed of EM waves.
Explain the relationship between brightness and amplitude of light waves.
Compare the speed of light in different materials.

Starter Questions

Read page 45 and answer the accompanying question on Google Classroom.

Day 2

MAP test

Day 3

Review pages 38-39, 46(Q7), 48(Q10, Q11), 50(Q14), 52(Q1), 58-59.

Day 4

Project: Identifying waste issues in the school and conducting a waste audit.

This quiz covers the fundamental concepts of electromagnetic waves, specifically light, including their speed, behavior in different mediums, and the effects of UV radiation. Test your understanding of how light interacts with the atmosphere and the importance of protecting yourself from excessive UV exposure.