Answer:
A
school bell is usually a big metallic plate with a heavy wooden hammer. When the
plate is struck strongly with a hammer, the plate begins to oscillate. The molecules
of the surrounding air are set into violent vibrations due to the large size of
plate. These vibrations have a frequency lying in the audible range 20 Hz to 20
kHz. Thus, sound waves are produced. These vibrations cause the neighboring air
molecules to vibrate. The process continues, thus the vibrations (or sound) are
propagated by means of air molecules to reach the entire school area.
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