Sounds are produced by vibrations that travel through a medium such as air. The document discusses how to construct and test a loudspeaker. It instructs the reader to plug in the speaker, turn on the voltage, switch it on at the mains, and listen as they move their ear closer to identify how the sound changes and what causes this. The learning objectives are to describe how sounds are produced, construct a loudspeaker, and explain how a loudspeaker works.

1. 21 March 2011
How are sounds made?
Answer the three questions on this side of the ticket.
You must attempt each one, it doesn’t matter if it’s
right or wrong! (you need the ticket for later so hold on
to it)
How is a sound made?
What does a speaker do?
What happens when you bring two magnets
together?

2. Learning objectives:
• Describe how sounds are produced (Level 4)
• Construct a loudspeaker (Level 5)
• Explain how a loudspeaker works (Level 7)

13. Testing your loudspeaker
1. Plug it into the AC • Describe how sounds are
points made (4)
2. Turn the voltage as low • What happens to the
as possible sound as you bring your
3. Switch on the plug at ear closer? What causes
the mains this? (5)
4. Switch on the switch on • Explain how a speaker
the front works (7)
5. Listen • Extension: how could you
change the sound
6. Move your ear right produced by your
above the speaker speaker? (8)

14. Homework: due Friday 25th March

16. 1.
2.
3.
Write down three things you
have learnt today that you did
not know before the lesson. They
can be ANYTHING… you cannot
leave for lunch until you do!

17. How is a sound made?
What does a speaker do?
What happens when you bring two magnets together?
How is a sound made?
What does a speaker do?
What happens when you bring two magnets together?
How is a sound made?
What does a speaker do?
What happens when you bring two magnets together?
How is a sound made?
What does a speaker do?
What happens when you bring two magnets together?

18. 1.
2.
3.
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2.
3.
1.
2.
3.
1.
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3.