Design and build a device that uses light or sound to solve the problem of communicating over a distance
A first look
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Question 1 of 3
Which device could a student use to send a spoken message to a friend across the playground?
Question 2 of 3
Fiber‑optic cables transmit information using light waves. Which statement correctly explains how the light waves are kept inside the fiber so that the information can travel long distances?
Question 3 of 3
Which of these devices could a student use to send a sound message to a friend who is standing far away?
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