Reflection of sound
Sound bounces off a
surface of solid or a liquid medium like a rubber ball that bounces off from a
wall. An obstacle of large size which may be polished or rough is needed for
the reflection of sound waves. The laws of reflection are:
·
The angle in which the sound is incident is equal to the angle in
which sound is reflected.
·
Direction of incident sound, direction of the reflected sound and
the normal are in the same plane.
Megaphones, loud
speakers, horns, musical instruments such as nathaswaram, shehnai and trumpets
are all designed to send sound in a particular direction without spreading it
in all directions. In these instruments, a tube followed by a conical opening
reflects sound successively to guide most of the sound waves from the source in
the forward direction towards the audience.
Stethoscope is a medical
instrument used for listening to sounds produced in the body. In stethoscopes
these sounds reach doctor’s ears by multiple reflections that happen in the
connecting tube.
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