Page 62 - Kid_s Box New Generation 5 Pupil_s Book

How do we make noises?

56 Listen and read. What creates sound?

THE SCIENCE OF SOUND

Sounds are created when objects vibrate. And these vibrations are
called sound waves. We can't see them, but they travel through the
air until they reach our ears, and we hear them as sounds.

If we shake a tiny bell, it Some sounds can be high but Sound needs to travel through
vibrates quickly, so we hear a very loud. Did you know that something, like an object or air or
high ring in our ears. If we hit a baby's cry is louder than the water. If there is no air, like in space,
a large bell, the sound waves honk of a car horn? However, there is no sound! Wind is air but it has
are stronger and vibrate the loudest sound on Earth is no sound. It's the wind blowing against
more slowly, so we hear a low low and loud - it's the sound an object that makes the sound.
sound. of a volcano erupting!
Sound travels four times faster through
water than air so it can travel further
through water. That's how whales can
hear each other
even when they
are hundreds
of kilometres
apart!

Read again and choose the correct words.

1 Vibrations of sound are called sound a energy b waves
2 Fast vibrations make a sound. a high b low
3 Slow vibrations make a sound. a low b high

4 Sound needs to travel through something, like or water. a air b space
5 Wind makes sound when it blows against a objects b air
6 In water, sound travels than in air. a faster b slower

Close your eyes and listen. What can you hear? What sounds do you like and dislike?

I can hear traffic outside the school.
I don't like it because it's too noisy. •FIND OUT MORE -
What is the maximum speed
of sound?
I can hear myself breathing.
I like it because it relaxes me.

60 Science: sound waves | | critical thinking