Multiple Reflection of Sound
Multiple Reflection of Sound
Multiple reflection of sound :Sound can get reflected a number of times before reaching us. The multiple reflections of the sound has anumber of uses and consequences.
Uses of Multiple Reflection of Sound: The reflection of sound is used in the working of devices such as megaphone, horns, stethoscope and sound board. These devices involve multiple reflections of sound waves.
1. Megaphone and Horn: Megaphone is large cone shaped device used to amplify and direct the voice of a person who speaks into it. A horn is a cone shaped instrument used for signalling in bicycles, cars, buses, etc. When a person speaks into the narrow end of the megaphone tube, the sound waves produced are prevented from spreading by successive reflections from the wider end of the megaphone tube, hence sound of his voice can be heard over a longer distance.
2. Stethoscope: It is a medical instrument used by doctors to listen the sound produced within the heart and the lungs in human body. The sound of heart beats (or lungs) reaches the doctors ears by the multiple reflections of sound waves through the stethoscope tube.
3. Sound Board: It is a concave board (curved board) placed behind the stage in big halls, so that sound after reflecting from sound board, spreads evenly across the width of the hall. Generally, the ceilings of the concert halls, conference halls and cinema halls are curved, so that sound after reflection reaches all corners of the hail.
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Mehaphone works on the principle of _____ of sound . | |||
| Right Option : B | |||
| View Explanation | |||
Sound Board is a ___________ board placed behind the stage in big halls, so that sound after reflecting from sound board, spreads evenly across the width of the hall. | |||
| Right Option : D | |||
| View Explanation | |||
Which of the following are correct : (a) Sound Board is a concave board (curved board) placed behind the stage in big halls. (b) Sound Board is a convex board (curved board) placed behind the stage in big halls. | |||
| Right Option : A | |||
| View Explanation | |||
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