首页
登录
职称英语
The range in frequencies of musical sounds is approximately 20-20,000 cycles
The range in frequencies of musical sounds is approximately 20-20,000 cycles
游客
2025-05-06
25
管理
问题
The range in frequencies of musical sounds is approximately 20-20,000 cycles per second (cy/sec). Some people can hear higher frequencies khan others. Longitudinal waves whose frequencies are higher than those within the audible range are called ultrasonic frequencies. Ultrasonic frequencies are used in sonar for such purposes as submarine detection and depth finding. Ultrasonic frequencies are also being tried for sterilizing food since these frequencies kill some bacteria. Sound waves of all frequencies in the audible range travel at the same speed in the same medium. In the audible range, the higher the frequency of the sound the higher is the pitch. The term supersonic refers to speed greater than sound. An airplane traveling at supersonic speed is moving at a speed greater than the speed of sound in air at that temperature. Mach 1 means a speed equal to that of sound. Mach 2 means a speed equal to twice that of sound, etc.
Musical sounds have three basic characteristics: pitch, loudness, and quality or timbre. As was indicated above, pitch is determined largely by the frequency of the wave reaching the ear. The higher the frequency the higher is the pitch. Loudness depends on the amplitude of the wave reaching the ear. For a given frequency, the greater the amplitude of the wave the louder the sound. To discuss quality of sound we need to clarify the concept of overtones. Sounds are produced by vibrating objects. If these objects are given a gentle push, they usually vibrate at one definite frequency producing a pure tone. This is the way a tuning fork is usually used. When objects vibrate freely after a force is momentarily applied, they are said to produce their natural frequency. Some objects, like strings and air columns, can vibrate naturally at more than one frequency at a time. The lowest frequency which an object can produce when vibrating freely is known as the object’s fundamental frequency. Other frequencies that the object can produce are known as its overtones. The quality of a sound depends on the number and relative amplitude of the overtones present in the wave reaching the ear. [br] The timbre of a musical sound is dependent on its ______.
选项
A、fundamental
B、amplitude
C、frequency
D、overtones
答案
D
解析
音乐的音质取决于它的泛音。作者在第二段末尾说,声音的音质取决于泛音的数量和泛音的相对振幅。
转载请注明原文地址:https://tihaiku.com/zcyy/4064931.html
相关试题推荐
Therangeinfrequenciesofmusicalsoundsisapproximately20-20,000cycles
Therangeinfrequenciesofmusicalsoundsisapproximately20-20,000cycles
Therangeinfrequenciesofmusicalsoundsisapproximately20-20,000cycles
Therangeinfrequenciesofmusicalsoundsisapproximately20-20,000cycles
Thoughherparents______hermusicalability,Jerrilou’spianoplayingisreall
Asa______actor,hecanperform,sing,danceandplayseveralkindsofmusical
Thecomposerssoonbegantowritemusicaldramas______aboutBiblestoriesinc
Evidencecameup______specificspeechsoundsarerecognizedbybabiesasyoung
Thecomposerssoonbegantowritemusicaldramas______aboutBiblestoriesinch
随机试题
[originaltext]MartinEdwards,chiefexecutiveofManchesterUnitedPIC,will
About______Americanhomeshavethehabitofkeepingpets.[br][originaltext]
Manydoctorscurevariouskindsofdiseases,butthetendencyistoward________
关于火灾隐患与火灾风险的说法,下列不正确的是()。A.火灾隐患是首先是一
下列各项属于资源税纳税人的有()。A、在中国境内开采原煤销售的国有企业 B、
下列选项中,CO分压最低的是()。A.静脉血液 B.毛细血管血液 C.肺泡
检疫期确定是根据该传染病的A、隔离期 B、传染期 C、最长潜伏期 D、最短
检验假设的方法有两种,分别是{}和间接检验。
247,18,229,﹣211,() A﹣358 B445 C0
实行核准制的工程项目,项目业主应做的工作主要包括:①向建设主管部门申请办理开工手
最新回复
(
0
)