# How does sound travel? Could you talk to somebody on the moon? WALT:

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How does sound travel? Could you talk to somebody on the moon? WALT:
describe how sound travels describe the type of wave explain why sound travels at different speeds in different substances.

Isabella - Morena – Marc - Danny
Pascal - Michi Celine Sofia Isabelle Ferdi - Nicolas - Aum Lewin - Manu - Isa - Soly Isabella - Morena – Marc - Danny Front

What do you remember? How do things make sounds?
How do things make louder sounds? How do things make higher sounds? Which of these will make the lower sound and why?

Answer the questions in whole sentences on the same page as last week.
What vibrates when you hit a tuning fork? Answer: When you hit a tuning fork, the tuning fork vibrates. Why does a smaller tuning fork give a higher note. What vibrates when you pull a string on the guitar? Why does a tighter string give a higher note? What vibrates when you blow in a bottle? Why does less water in the bottle give you a lower note? What vibrates when you sing?

How does sound travel? How does sound get from an instrument to your ear?

Sound travels in waves Lesson 1 sound waves - till page 7 When one particle vibrates, it makes the next particle vibrate and so on . You can see this in: a slinky Or in a ripple tank.

Does sound travel through solids, liquids and gases?
How are the particles arranged in solids, liquids and gases? In solids the particles are closer together so the sound wave travels more easily. In gases the particles are farther apart so the sound wave doesn‘t travel as fast. Would sound travel through a vacuum?

Complete the worksheet.
Then answer these questions: How could you show in an experiment that a tuning fork vibrates when it makes a noise? When a thunderstorm is far away, you see the lightning before the thunder, why is this? Sound needs a material to travel. Describe an experiment to show this is true.

Sound travels in waves. The part of the wave which has more energy is called compression and the part which has less, rarefraction

Sound travels through solids, liquids and gases
In solids the particles are closer together so the sound wave travels more easily. In gases the particles are farther apart so the sound wave doesn‘t travel as fast. material speed of sound (m/s) air water 1400 wood 3400 steel 5100

Summary What have we learnt: Can you describe how sound travels?
describe the type of wave? explain why sound travels at different speeds in different substances?

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