Sound Reverberation Echoes may be heard more than once due to repeated or multiple reflections of sound from several reflecting surfaces. This causes persistence.

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Sound Reverberation Echoes may be heard more than once due to repeated or multiple reflections of sound from several reflecting surfaces. This causes persistence of sound called reverberation.

Sound Reverberation In big halls or auditoriums to reduce reverberation, the roofs and walls are covered by sound absorbing materials like compressed fibre boards, rough plaster or draperies.

Sound Multiple Reflection of Sound Megaphones, horns, musical instruments like trumpets, shehnais etc. are deigned to send sound by multiple reflection in a particular direction without spreading in all directions.

Sound Multiple Reflection of Sound Doctors listen to sounds from the human body through a stethoscope. The sound of heartbeat reaches the doctor's ears by multiple reflection.

Sound Multiple Reflection of Sound Generally the ceilings of cinema halls and auditoriums are curved so that sound after multiple reflection reaches all parts of the hall. Sometimes a curved sound board is placed behind the stage so that sound after multiple reflection spreads evenly across the hall.

Sound Ultrasound Ultrasound is an oscillating sound pressure wave with a frequency greater than the upper limit of the human hearing range. Ultrasounds are used extensively in industries and for medical purposes.

Sound Applications of Ultrasound (a)Ultrasonic sound is used to clean objects like electronic components. The components to be cleaned are kept in a cleaning solution and ultrasonic waves are sent into the solution. Due to the high frequency, the dirt particles get detached from the components. (b) Ultrasonic sound is used to detect cracks in metal blocks. Ultrasonic waves are sent through the metal blocks and if there are cracks, the waves are reflected back and the cracks can be detected.

Sound (c) Ultrasonic sound is used in ultra sound scanners for getting images of internal organs of the human body. Applications of Ultrasound (d) It is used as a tool in the treatment of muscular pain. (e) It is used to detect defective foetus.