21.1. Electromagnetic Waves http://www.ck12.org
Lesson Review Questions
Recall
- Define electromagnetic radiation.
- What is an electromagnetic wave?
- How do electromagnetic waves interact with matter?
- What is a photon?
- Identify sources of electromagnetic waves.
Apply Concepts
- Create a diagram to represent an electromagnetic wave. Explain your diagram to another student who has no
prior knowledge of electromagnetic waves.
Think Critically
- Explain how an electromagnetic wave begins.
- Compare and contrast mechanical transverse waves and electromagnetic transverse waves.
Points to Consider
In this lesson, you learned that electromagnetic waves are transverse waves. Like other transverse waves, electro-
magnetic waves have certain properties.
- Based on your knowledge of other transverse waves, such as waves in a rope, what is the wavelength of an
electromagnetic wave? How is it measured? - How do you think the wavelengths of electromagnetic waves are related to their frequencies? (Hint:How is
the speed of waves calculated?)