Page 66 - Science Class 6 Times Publication

Chapter
Chapter

6 SOUND

Estimated periods:4

OBJECTIVES

At the end of the lesson, the students will be able to :
Ü dene sound.

t
Ü ell some sources of sound.
Ü give simple introduction of wave.

Ü xplain propagation of sound through various media.

e
MIND OPENERS
Ü What happens when you blow whistle?
Ü How do you hear the sound produced from any object?
Ü Can sound travel through water? Can sound travel through
vacuum? Discuss.

Introduction

We hear various types of sounds everyday. We hear sound of vehicles,
animals, human beings, radio, television, musical instruments, etc.
Some sounds are pleasant whereas some others are unpleasant. But,
all types of sounds are produced by the vibration of objects. All sounds
produce sensation of hearing in our ears.

So, sound is a form of energy which produces the sensation of hearing
in ears.

Sources of sound
Any object which produces sound is called a source of sound. Radio,
television, madal, guitar, animals, vehicles, human beings, machines,
etc are sources of sound. All sources produce sound through vibration.
Therefore, any vibrating body is the source of sound.

Times' Crucial Science and Environment 62 Book 6