2. 外语
  3. Can You Hear This? When something creates a sound wave in a room or an auditorium(礼堂), listeners hear the sound wave directl

Can You Hear This? When something creates a sound wave in a room or an auditorium(礼堂), listeners hear the sound wave directl

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问题                         Can You Hear This?
    When something creates a sound wave in a room or an auditorium(礼堂), listeners hear the sound wave directly from the source. They also hear the reflections as the sound bounces off the walls, floor, and ceiling. These are called the reflected wave or reverberant(反射的)sound, which can be heard even after the sound is no longer coming from the source.
    The reverberation time of an auditorium is determined by the volume or interior size of the auditorium. It is also determined by how well or how poorly the walls, ceiling, floor, and contents of the room(including the people)absorb sound. There is no ideal reverberation time, because each use of an auditorium calls for different reverberation. Speech needs to be understood clearly; therefore rooms used for talking must have a short reverberation time. The full-sound performance of music such as Wagner operas or Mahler symphonies should have a long reverberation time. The light, rapid musical passages of Bach or Mozart need a reverberation time somewhere between.
    Acoustic problems often are caused by poor auditorium design. Smooth, curved(弯曲的)reflecting surfaces create large reflections. Parallel(平行的)walls reflect sound back and forth, creating a rapid, repetitive pulsing(有节奏的跳动)effect. Large pillars(柱)and comers can cause acoustic shadows as the sound waves try to pass around the object. Some of these problems can be solved by using absorbers and reflectors to change the reverberation time of a room. For example, hanging large reflections, called clouds, over the performers will allow some sound frequencies to reflect and others to pass to achieve a pleasing mixture of sound.
This passage is mainly about______.
选项 A、sound waves and their effects
B、the types of music orchestras play
C、walls of an auditorium
D、the design of an auditorium
答案D
解析 本文首先解释了什么是回声，并围绕混响对礼堂建筑构造的影响展开说明，最后又说到建筑内部不合理引起的一些声学问题也可以通过改变构造达到良好的音效。所以全文都在讨论礼堂的设计构造，故选D。
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本试题收录于： 职称英语理工类B级题库职称英语分类
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