Do It Yourself: Experiments with Sound

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When can you hear the Doppler effect?
Which animal makes the loudest sound?
How can curtains stop an echo?
What sounds have you heard today? Try to remember as many as possible. Perhaps your day started when the sound of your alarm clock woke you up. Think about all the different sorts of sounds you have heard since then - the swish of water in the shower, the crunch of eating your breakfast, the crash when you closed a door, chirping birds and barking dogs, and the roar of traffic. Natural and human-made sounds are all around us every day.