Transcript Lesson 3 Hearing Sound

Lesson 3 – Hearing Sound
Lesson Aims:
To learn how humans and animals
hear sounds.
Learning Outcomes:
By the end of the lesson you should be able to
• Explain that sound waves make our eardrums
vibrate
• Describe how this vibration enables us to hear
sounds
• Explain how the ear works
• Describe results of an investigation into
hearing
• Give examples of hearing ranges of animals
Listen quietly to the sound
• Put your hand up when you can no longer hear
it
• Humans can usually hear between the ranges
of 20Hz and 20 000 Hz
• The lowest frequency I can hear is ______Hz
• The highest frequecy I can hear is ______
Hz
Read Page 103
1.Explain why some people have different
hearing ranges
2. List the animals in order of the highest
frequency they can hear and explain why they
each have different hearing ranges ti humans
How sound travels…
As we know, sound waves are formed when something vibrates.
But how does the sound reach our ears?
Air molecules
1) An object
makes a
sound by
vibrating
2) The vibrations pass
through air by making
air molecules vibrate
3) These
vibrations are
picked up by
the ear
The Ear - Animation
5
How does the ear work?
1) Sound waves
are “funnelled”
into the ear by
the pinna
2) These
vibrations
make the ear
drum vibrate
5) The electrical
signals are then
sent to the brain
3) These vibrations make
the ear bones vibrate
4) These
vibrations are
turned into
electrical
signals in the
cochlea
Ear - Labelled
Complete the worksheet of
how the ear works and paste
into your books
Extension answer questions on
page 104
Watch the video
• Write down three key points for this lesson
• Homework: Explain to an adult how the ear
works
(They must sign your daybook to say you have
done this )