2. Radio waves have a very long wave length.
I hope it will help full for you
A widely accepted theme of "The Mending Wall" narrates the self-imposed obstruction that prevents human discussion.
In the poem, the neighbor of speaker pointlessly reconstruct a wall; more than helping anyone, the fence is harmful to them.
But the neighbor is relentless in its maintenance.
The speaker is upset with his neighbor does not think seriously about the fence, instead of relying on traditional reasoning.
Definition - When sound travels in a given medium, it strikes the surface of another medium and bounces back in some other direction, this phenomenon is called the reflection of sound
1) for hearing eco
2) also use in sonography machine
3) Use in SONAR techniques
Reflection of Sound : When sound travels in a given medium, it strikes the surface of another medium and bounces back in some other direction, this phenomenon is called the reflection of sound. The waves are called the incident and reflected sound waves. 0. Comments.
Reflection of sound is used to measure the distance and speed of underwater objects. This method is known as SONAR. Working of a stethoscope is also based on reflection of sound. In a stethoscope, the sound of the patient's heartbeat reaches the doctor's ear by multiple reflections of sound.
The reflection of sound is used in many devices as the megaphones, the horns, the musical instruments like the trumpet, the shehnais, etc, The ceilings of the cinema halls and the auditoriums are curved so that the sound after multiple reflections reaches all parts of the hall.
This poem ‘Walls and Fences’ has almost the same theme as that of the poem ‘Mending Walls’, written by Robert Frost.
Both poems question the reason of building walls between the lands, which actually depicts the creation of barriers between two humans.
Both poems cite that the real walls exist between the minds of the people, taking them far apart from each other.
In stethoscope, the sound of patient's heartbeat is guided along the tube of the stethoscope to the doctors ear by multiple reflections of sound. Horns, musical instruments such as trumpets and sehnais, loudhailers (megaphones), loudspeakers, etc., are all design to keep sound from spreading in all directions.
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(d) neither 1 nor 2