How We Hear Sound. Lesson 9

1.

L4
CHAPTER 3
Lesson 9

2.

Warm up
a
Lesson 9
How We Hear Sound
Before You Read
b
Look at the pictures.
Who can’t hear sound? Why?
d
c
The man in picture ⓓ can’t
hear sound because there is
no air in space. Air is a
medium that carries sound.

3.

Video
a
Lesson 9
How We Hear Sound
Before You Read
b
Look at the pictures.
Who can’t hear sound? Why?
d
c
The man in picture ⓓ can’t
hear sound because there is
no air in space. Air is a
medium that carries sound.

4.

Key Words

5.

Listen & Repeat
attach

6.

Listen & Repeat
vibrate

7.

Listen & Repeat
잘려진 음원 없음
shake

8.

Listen & Repeat
firm

9.

Listen & Repeat
medium

10.

Listen & Repeat
empty

11.

Practice
firm

12.

Practice
attach

13.

Practice
medium

14.

Practice
vibrate

15.

Practice
empty

16.

Practice
shake

17.

Words & Meaning
to connect something to
something else
?
attach
v

18.

Words & Meaning
to move with very short,
rapid motions
?
vibrate
v

19.

Words & Meaning
to quickly move
something back and forth
?
shake
v

20.

Words & Meaning
hard or solid
?
firm
a

21.

Words & Meaning
a substance through
which something moves
?
medium
n

22.

Words & Meaning
not containing anything
?
empty
a

23.

Check up
vibrate
shaking
empty
attaching
firm
medium