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.
Wagner operas and Mahler symphonies sound with full-sound effect have______.
选项 A、a short reverberation time
B、a long reverberation time
C、an intermediate reverberation time
D、no reverberation time
答案B
解析 由第二段中的The full—sound performance of music such as Wagner operas or Mahler symphonies should have a long reverberation time可知，瓦格纳的歌剧和马勒的交响曲听起来立体圆润是因为混响时间长，故选B。
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