Write three uses of multiple reflection of sound.
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1) Megaphones and musical instrumentsà Megaphones or loudhailers, horns, musical instruments 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 sounds successively to guide most of the sound waves from the source in the forward direction.
2) Stethoscopeà In stethoscope the sound of a patient's heartbeat is guided by along the tube of the stethoscope to the doctor's ears by multiple reflections of sound.
3) Curved ceilingsà the ceilings of a concert halls, conference halls and cinema halls are made curved so that sound after reflection reaches all the corners of the halls.
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2) Stethoscopeà In stethoscope the sound of a patient's heartbeat is guided by along the tube of the stethoscope to the doctor's ears by multiple reflections of sound.
3) Curved ceilingsà the ceilings of a concert halls, conference halls and cinema halls are made curved so that sound after reflection reaches all the corners of the halls.
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