Buku SMP Athalia
Bell and The Science of The Telephone
What he sciencets say :
1. You can make a simple telephone using youghurt and a piece of string.
2. Sound can be sent by light signals in fibre-optic cables.
3. The cone shape of megaphone stops sound waves spreading out too quickly and makes them travel futher.
4. Mobile phones transmit your calls by radio waves.
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