. Echoes of bats and men . Zdab= Zeac Fig. 9. The law of reflection describes the way in which sound reflects from a large flat surface. When making this experiment, observe the relative positions of the two boys. liquely, the echoes will rebound away from the clicker, as indicated in Fig. 9. This is why it is so easy to locate a building by scanning with the clicker; the echo is far louder when the horn is pointed straight at the wall. Two people can co-operate in a simple experiment that dem- 76

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