. Echoes of bats and men. Sound-waves; Echolocation (Physiology); Orientation. 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 rebou
. Echoes of bats and men. Sound-waves; Echolocation (Physiology); Orientation. 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. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Griffin, Donald R. (Donald Redfield), 1915-. Garden City, N. Y. : Anchor Books
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