Video Transcript for 'Sound'
SEYMOUR: Hello! Seymour Science here with my musical friend Davina鈥nd today we鈥檙e talking about鈥OUND! La, la, la la la la la laaaa鈥.
DAVINA: Err, thanks Seymour! So, how are sounds made? Well, sounds are made when objects - like this string - vibrate. When it vibrates it makes a sound鈥nd when it鈥檚 not vibrating it makes no sound at all! Every time an object vibrates, it sends invisible sound waves through the air to our ears, which changes those waves into little messages that our brain understands as sound! So let鈥檚 try that string again!
SEYMOUR: But some things sound low and some things sound high. How does that work?
DAVINA: Well, if we use a thinner string, it will vibrate faster when we strum it. The faster something vibrates, the higher the sound will be. If the sound is loud, or quite low, people who cannot hear sounds can sometimes feel the vibrations.
SEYMOUR: And sounds can help keep us safe too!
DAVINA: Yes they can, just think of the beeps we hear when we cross the road鈥 or the sirens on fire engines as they whizz past鈥
MUM: Mum: Seymour, is that you two making all that noise?!
SEYMOUR: Eek, best go!
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