Echoes of bats and men Echoes of bats and men echoesofbatsmen00grif Year: 1959 ECHOES OF BATS AND MEN wave lengths of a few centimeters. When such wave lengths strike the wall of a building, they are reflected almost exactly as Hght waves would be from a mirror. If the clicker is pointed directly at the wall, the echo will come straight back, but if the emitted sound strikes ob- 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 reb
Echoes of bats and men Echoes of bats and men echoesofbatsmen00grif Year: 1959 ECHOES OF BATS AND MEN wave lengths of a few centimeters. When such wave lengths strike the wall of a building, they are reflected almost exactly as Hght waves would be from a mirror. If the clicker is pointed directly at the wall, the echo will come straight back, but if the emitted sound strikes ob- 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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