Waves on water in a ripple tank are often used as a model to help students to understand sound waves and light waves.
Compare and contrast waves on water, sound waves and light waves

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Explanation:

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graph slopes whilst gas cools, then it is flat whilst conensation to liquid happens, the coolong liquid then graphs as a slope when it solidifies graph is flat

latent heat

answer; how far out of place which the object finished relative to the starting location;