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denian
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i read in the book. it stated that sound can be reflected by a barrier and the barrier must be large ( 10metre or more ).
why?
why?
Sound waves travel in a straight line until they encounter an obstacle, at which point they reflect off of it. To completely block the sound from reaching the other side, the barrier must be tall enough to act as a physical obstacle for the sound waves to bounce off of. A 10m barrier is typically enough to completely reflect the sound waves and prevent them from passing over the top.
Yes, a shorter barrier can still provide some sound reflection, but it may not be enough to completely block the sound. Sound waves can diffract and bend around obstacles, so a shorter barrier may still allow some sound to pass through or over it.
The closer the sound source is to the barrier, the more the sound waves will spread out and diffract around the barrier. This can decrease the effectiveness of the barrier for sound reflection. Therefore, it is important to have a sufficient distance between the barrier and the sound source for optimal sound reflection.
Materials that are dense and have a smooth surface are best for sound reflection. This is because sound waves are more likely to bounce off of a solid, smooth surface rather than being absorbed or scattered by a rough or porous material. Concrete and metal are commonly used for sound barriers due to their density and smoothness.
Yes, other factors such as the angle of the sound waves hitting the barrier, the direction of the wind, and the presence of nearby structures or objects can also impact sound reflection. These factors can cause sound waves to diffract or scatter, reducing the effectiveness of the barrier for sound reflection.