Page 82 - Science Course 3 (Book 2)

Light Waves and Sound Waves Mo10-L5a: How are Light Waves Different
From Sounds Waves?
Lesson 5

Let’s Begin

In this topic, you will learn the following What is Light?
lessons:
Mo.10–L5a: How are Light Waves Different Light is an electromagnetic wave that can travel
From Sounds Waves? through matter.
Mo.10–L5b: Interaction of Light Waves with
Matter

Mo10–L5a How are Sound Waves Produced?

KEY CONCEPTS:
1. How are light waves different from sound waves?
2. How do waves in the electromagnetic spectrum
differ?

Vocabulary A-Z
Let us learn some vocabulary Unlike sound waves, light can also travel through a

vacuum, where no matter is present.
light source Light waves travel much faster than sound waves.
something that emits light.

GLASS PRISM
SUN LIGHT

light ray
Light waves slow down when they travel through
represents a narrow beam of light that travels in a matter.
straight line.

Speed of Light Waves in Some Materials

Material Wave Speed(km/s)

Vacuum 300,000

Air 299,920

Water 225,100

Glass 193,000

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