首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
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
admin
2016-08-16
41
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。
转载请注明原文地址:https://kaotiyun.com/show/htQd777K
本试题收录于:
职称英语理工类C级题库职称英语分类
0
职称英语理工类C级
职称英语
相关试题推荐
A.RiskofScreeningtoYoungerWomenB.InvestigatingtheEffectofScreeningC.EffectsPredictedbyTwoDifferentMod
Salesmanshipistheabilitytoswaypeopletowillinglybuyproductsorsupportnewideas.
Einstein’stheoryofrelativityissoabstrusethatveryfewpeoplecanappreciateit.
Fortunatelytherearestillafewtastythingsforustoenjoyinrelativesecurity.Theirnumbers,however,aredepletedalmost
Inthe1ststudy,studentswhostayuplate______.AccordingtoDr.Pagel,theacademicperformanceofastudentwillbeaffect
Youpossessaffluence,butitdoesn’tmeanyoucanhaveeverythinginhand.
RobertBeckett,whobrokehislegandhadtohaveitsetatthelocalhospital,wasgivensomethingtoputhimtosleepwhileth
Shealwaysfindsfaultwitheverything.
Formanypeopletoday,readingisnolongerrelaxation.Tokeepuptheirworktheymustreadletters,reports,tradepublication
Formanypeopletoday,readingisnolongerrelaxation.Tokeepuptheirworktheymustreadletters,reports,tradepublication
随机试题
设在(一∞,+∞)内连续,求a,b的值.
梗阻性黄疸尿中主要的胆红素
某患者的血.常规检查结果为:RBC4.68×1012/L,Hb96g/L,WBC6.5×109/L,Plt220×109/L。根据现有资料首先考虑为
西林瓶灭菌采用的是生产车间的空门消毒采用的是
对大咯血病人应重点观察
设f(x,y)=,则fy(1,0)等于()。
井下水害事故的处理,做法不正确的是()。
土地增值收益主要是由于土地的用途改变或土地功能变化而引起的,这种改变所带来的增值收益应归土地转让者所有。()
心事浩茫连广宇,___________。(鲁迅《无题》)
A、Theannouncershouldtrynottosoundnervous.B、Thewomanshouldnotbenervous.C、Theplanewillarriveat9:20.D、Thewoman
最新回复
(
0
)