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Science 4th grade با پاسخ UNIT 4: Sound 4.1 Sound travels through the materials
Sounds come from sources
Sunita hears an aeroplane passing overhead.
The aeroplane is a source of sound. Sunita hears the sound when it enters her ears.
The sound can travel from the aeroplane to Sunita's ears.
Activity 4.1 (Make a tin can telephone)
You will need: a piece of string about 3 m long - two empty tin cans
Look at the pictures to see what to do.
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Sound travels through different materials
Sound travels through materials, like string.
Sound can travel through different kinds of materials.
Questions
1) What is the source of sound in the tin can telephone?
2) Which materials does the sound travel through in the tin can telephone?
3) Why did the Native American people lie with one ear in the ground to listen for enemies or animals to hunt?
