Application of reflection of sound waves?

Answer 1

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.

4) Sound boardsà in large halls or auditorium, large concave wooden boards are placed behind the speaker. The speaker stands at the focus of this concave reflecting surface. After reflection the sound is spread evenly towards the audience. This makes the sound readily available even at a distance.

Answer 2

(1) Megaphone

: Megaphone is a horn-shaped tube. The sound waves are prevented from spreading out by successive reflections and are confined to the air in the tube.

(2) Hearing aid
: It is a device used by the people who are hard of hearing. Here the sound waves, which are received by the hearing aid are reflected into a narrower area leading to the ear. (3) Sound Boards: Curved surfaces can reflect sound waves. This reflection of sound waves is used in auditorium to spread the waves uniformly throughout the hall. Reflection of sound waves is done by using Sound Boards. The speaker is located at the focus of the sound board. Musical Sound and NoiseA musical sound can be defined as a pleasant continuous and uniform sound produced by regular and periodic vibrations.

Example: The pleasant sound produced by a guitar, piano, tuning fork etc.

Noise can be defined as an irregular succession of disturbances, which are discordant and unpleasant to the ear.

EchoThe sound heard after reflection from a rigid obstacle (such as cliff, wall) is called echo.

Answer 3

some applications of reflection of sound waves are:

1. in the measurement of distance.

2. use of SONAR in detecting sunken ships,materials in seas.

3.detection of cracks or flaws in metals.

4.determination of frequency of A.C's.

Answer 4

Generally the ceilings of cinema halls and auditoriums are curved so that sound after multiple reflection reaches all parts of the hall.