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Uses of Multiple Reflection of Sound

We will now discuss some of the practical applications of the rflection of sound. The reflection of sound is utilized in the working of devices like megaphone, sound boards and ear trumpet. These are described below:
 

A megaphone (or speaking-tube) is a horn-shaped tube, which is used to address a small gathering of people at places like tourist spots, fairs, and market places and during demonstrations. One end of the megaphone tube is narrow and its other end is quite wide. When a person speaks into the narrow end of the megaphone tube, the sound waves produced by his voice are prevented from spreading by successive reflections from the wider end of the megaphone tube. Due to this the sound of the voice of the person can be heard over a longer distance.

Thus, a megaphone (or speaking-tube) works on the reflection of sound. The loudspeakers also have horn-shaped opening so that the sound of the voice of speaker (or music) can be heard by a large gathering over a considerable distance.

The sound board is a concave board (curved board), which is placed behind the speaker in large halls or auditoriums so that his speech can be heard easily even by the persons sitting at a considerable distance. The sound board works as follows: The speaker is made to stand at the focus of the concave sound board. The concave surface of the sound board reflects the sound waves of the speaker towards the audience (and hence prevents the spreading of sound in various directions).

Due to this, sound is distributed uniformly throughout the hall and even the persons sitting at the back of the hall can hear his speech easily. It is obvious that the sound boards work on the reflection of sound.

 

The ear trumpet is a hearing aid, which is used by the persons who are hard of hearing. One end of the ear trumpet is wide, whereas its other end is narrow. The sound waves from a large surrounding area fall on the wide end of the trumpet, which reflects them into its narrower end that leads into the ear. In this way, more sound energy falls on the eardrum of the person and that leads into the ear. In this way, more sound energy falls on the eardrum of the person and improves his hearing capacity. Thus, an ear trumpet also works on the reflection of sound.
 

In a stethoscope the heart beat of a patient reaches the doctor’s ears by multiple reflection of sound.

 





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