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Baynards Primary School

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Class 3 science lesson

In our science lesson, we made telephones using plastic cups and string to investigate how sound travels. We spoke into one cup and listened at the other to see what would happen. We tested different lengths of string and also tried pulling the string loosely and tightly. We discovered that the sound travelled best when the string was pulled tight and was longer. This is because the vibrations from our voices moved more easily along the string when it was stretched, carrying the sound more clearly from one cup to the other.