![]() ![]() A hard material such as concrete is as dissimilar as can be to the air through which the sound moves subsequently, most of the sound wave is reflected by the walls and little is absorbed. For this reason, acoustically minded builders of auditoriums and concert halls avoid the use of hard, smooth materials in the construction of their inside halls. As discussed in the previous part of Lesson 3, the amount of reflection is dependent upon the dissimilarity of the two media. When a wave reaches the boundary between one medium another medium, a portion of the wave undergoes reflection and a portion of the wave undergoes transmission across the boundary. In this part of Lesson 3, we will investigate behaviors that have already been discussed in a previous unit and apply them towards the reflection, diffraction, and refraction of sound waves. Possible behaviors include reflection off the obstacle, diffraction around the obstacle, and transmission (accompanied by refraction) into the obstacle or new medium. Rather, a sound wave will undergo certain behaviors when it encounters the end of the medium or an obstacle. Yes, phenomena of diffraction can occur in sound waves.Like any wave, a sound wave doesn't just stop when it reaches the end of the medium or when it encounters an obstacle in its path. When a sound wave encounters an obstacle or passes through a small aperture, it bends around the edges and spreads out into the region behind the obstacle. This bending of sound waves around the corners or edges of an obstacle is called diffraction. When sound waves travel through a medium, they move in a straight line, but when they encounter an obstacle or a small aperture, they bend or diffract around the edges of the obstacle. The larger the wavelength, the more significant the diffraction.ĭiffraction can be observed in several scenarios, such as: The amount of diffraction depends on the size of the obstacle or aperture and the wavelength of the sound wave. When sound waves pass through a narrow slit or aperture, they diffract and create a series of interference patterns on a screen placed behind the slit. When sound waves encounter a sharp edge of an obstacle, they diffract and spread out into the region behind the obstacle, creating a shadow zone where the sound intensity is lower. ![]() When sound waves encounter an obstacle with a curved surface, they diffract around the curved surface and create a sound shadow zone behind the obstacle. Thus, diffraction is a fundamental property of sound waves that plays a crucial role in several applications, such as soundproofing, acoustic design, and music production. Understanding the principles of diffraction in sound waves can help us design better sound systems and optimize their performance. Read the following text and answer the following questions on the basis of the same:Diffraction in a hall:A and B went to purchase a ticket of a music programme. But unfortunately only one ticket was left. They purchased the single ticket and decided that A would be in the hall during the 1st half and B during the 2nd half.Both of them reached the hall together. A entered the hall and found that the seat was behind a pillar which creates an obstacle. He thought that he would not be able to hear the programme properly.B was waiting outside the closed door. ![]()
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