Recognise that vibrations from sounds travel through a medium (solid, liquid, or gas) to the ear
A first look
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Question 1 of 3
A student uses a string telephone made of two paper cups connected by a tightly stretched string. Which explanation correctly describes how the sound from the speaker’s voice reaches the listener’s ear?
Question 2 of 3
A researcher puts a tiny speaker inside a clear glass jar. In the first test she leaves the air inside the jar untouched. In the second test she uses a pump to suck out all the air, making a vacuum inside the jar. She turns the speaker on at the same volume in both tests. Which test will let a child standing outside the jar hear the speaker, and why?
Question 3 of 3
A string telephone is made by stretching a long piece of string between two paper cups. When a person speaks into one cup, the other person can hear the sound. Which statement best explains how the sound reaches the second cup?
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