51fly国际课程 (51fly.win)

 找回密码
 立即注册

手机扫一扫，访问本页面

 

      

上传图片附件

未使用图片

小贴士: 允许的图片文件格式为: gif, jpg, jpeg, png, webp，上传完成后会在上方生成预览，用鼠标连续双击缩略图，或拖动缩略图，该图片就被绑定至本题，显示在题目下方

本次作答已使用

小贴士: 此栏目显示的是当前作答使用的所有图片，绑定到某一题目的图片同时会显示在该题目下方; 删除使用的图片会将其转移到<未使用图片>类别


习题练习：Physics Unit12: Sound
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 70 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://51fly.win/test70.html
 作者: physics  发布日期: 2022-09-26 09:56    总分: 87分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月07日 09:59  切换到: 整卷模式

标记此题
1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following .2o s0ezga 3cwis a false statement?

参考答案:    
标记此题
2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In general, sound is o :n2dn9pis u(conducted fastest through

参考答案:    
标记此题
3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the speed of sound in a steel rods. p8yfs.iz6d?

参考答案:    
标记此题
4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the temperature of the air increases, what happens to the ve8 le60j u )2duzp6pkqylocity of sound? (Assume that all other fa)y8ul6up0z k pjqe d26ctors remain constant.)

参考答案:    
标记此题
5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the velocity of a 400 Hz sound, the velocity of a 200 Hzc n6g/u/r9sbi fyu 6s, sound througgb,s6 /cusr9/ fyn6uih air is

参考答案:    
标记此题
6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the wavelength of a 400 Hz sound, the *tat1lm1op7 fwavelength of a 200 Hz sound in air i*lma p7t1 t1ofs

参考答案:    
标记此题
7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequencies greater than 20,0tvi ;de3h5 1xb00 Hz are called

参考答案:    
标记此题
8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequency less than 20 Hz vl ba 67n--fkvare called

参考答案:    
标记此题
9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a sound source is emitting waves uniformly in all diyi1:kghacve ug )t5;9rn:ed1 g z9r* frections. If you move to a pdk*:) c1ef9rg1aztg :n uvg;9ri5h eyoint twice as far away from the source, the frequency of the sound will be

参考答案:    
标记此题
10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  For spherically diverging waves, intensity ))yro4 d4/vwjik7orwis proportional to

参考答案:    
标记此题
11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity of a point source at a distance d from .wzu- r 5b+xxtthe source is I. What is the intensitbr+x.u xt -5wzy at a distance 2d from the source?

参考答案:    
标记此题
12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You double your distance cll64anz sv*w c.4nzo2fzl; + from a sound source that is radiating equally in all direct anv;+wc.4*oll6zfzz4s 2nclions. What happens to the intensity of the sound? It reduces to

参考答案:    
标记此题
13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You double your distance from a sound sour:v348i h8rw pr-0uhjl 1sgv bxce that is radiating equally in all direu- r1:sjx gwl4h rp 8vbihv308ctions. What happens to the intensity level of the sound? It drops by

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following increases as a sound o(tk -m -t;uwrvvt.p:, t(j6ug3 vp habecomes louder?

参考答案:    
标记此题
15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You move slowly toward a speaker emitting a pure tone. What characteh/zzt71mvqi 03c 3 h(n0g hhwyristic of the sound inhi g317 0ynhhm 3cz (0zhwqvt/creases?

参考答案:    
标记此题
16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" of a m 4kjwvsdk:2: 30bswbdusical note?

参考答案:    
标记此题
17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the "pibwnn: j x;br 4pi*k,/itch" of a musical note?

参考答案:    
标记此题
18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When sound passes from air 1 o5d o3xjzgv4into water

参考答案:    
标记此题
19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displaces.ofr zsa-wd 7 i4qgmnr*;3)l ment waves are

参考答案:    
标记此题
20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider the standing wave on a guitar string xvo 2ee xog(0mqs2d 0/and the sound wave generated by the guitar as a result of this vibration. What do these two wave(qeodm 0v sxo g20/2exs have in common?

参考答案:    
标记此题
21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a resonating pipe which is open at both endmrhx3xk 4zf(w0(my/d s, there

参考答案:    
标记此题
22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an open pipe of lengteta6vazji+z24)oy e (h L. What are the wavelengths of the three lowest tonez jezit( +ey24vaa6o) s produced by this pipe?

参考答案:    
标记此题
23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The lowest tone to resonate in an o2.mn )0vzvn:t6gvy eypen pipe of length L is 200 Hz. Which one of the following frequencies will not resonate in the same pip 2gvze)nvn ym:t06.yve?

参考答案:    
标记此题
24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An open pipe of length Ljybyaf2 yo--t hs531h is resonating at its fundamental frequency. Which statement is correhs2t31 -fyaj5y ho y-bct?

参考答案:    
标记此题
25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a resonating pipe which b xxvyvp5d;x.o0sm 3s: ,zu+on/ je+6fr btv9is open at one end and closed at the other, there

参考答案:    
标记此题
26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider a closed pipe of l i8 z0xch28fqbrhf5 v5ength L. What are the wavelengths of the three lowest tones prodcvx5ib08h r q8 fh5fz2uced by this pipe?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The lowest tone to resonate in a closed pipe of le q/fs.uj cj 2er0q5;dungth L is 200 Hz. Which of the following frequencies will not resonate5ecu fdqsj2.rqu /j;0 in that pipe?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pipe of length L closed at one end is res4u q.vhany v4 mx3/prki 06nl5onating at its fundamental frequency. Which statement is cor54r0i/m6vv4.u 3qlha pnkx nyrect?

参考答案:    
标记此题
29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A person stands between two speakers driven by the;w zta 128i1rmxwo:mx same source. Each speaker produces a tone with a frequency of 200 Hz on a d;1mt:wm ix21xo8rzwa ay when the speed of sound is 330 m/s. The person is
1.65 m from one speaker and 4.95 m from the other. What type of interference does the person sense?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In order to produce beats(f g,w 1vew8mz, the two sound waves should have

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two pure tones are sounded together and a particulhn lby.c -5sx)p.3ewaar beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones is in5 bansh3-y )elc pw.x.creased?

参考答案:    
标记此题
32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift expl mw +hf*7mkuhkp7a05 sains

参考答案:    
标记此题
33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approaches a statio g(ko0ym-e 8tenary observer. The frequency heard by the obsere8o (e0kmygt-ver is

参考答案:    
标记此题
34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source departs from a stationary observer. The frequencye, c8 .o0zql lkiei8vkpit9 3gq/j8 f+ heard by the observer iszc g ojq .,+iik8qpit0ev8f 8l/e3l9 k

参考答案:    
标记此题
35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a jet plane were to double its MACH-speed, its half-angle will decrease b99 eo2ys7jb/:hv9e h f qyryn9y a facbqyyy2eo 79vs999/n j:hf erhtor of:

参考答案:    
标记此题
36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The speed of an ultrasonic sound of frequency 45 kHz in air is 352 m/s. 5h4 yb7qmlp;z nu -*u:tlvb)r What is the air temperat4hpzl qm):bt b-vrl*u ;75 unyure?

参考答案:    
标记此题
37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the ratio of the speed of sound in air at o 02aixss +tnu4p/3rhc .9ceo$0 \; ^{\circ}C$ to the speed at $100 \; ^{\circ}C$?

参考答案:    
标记此题
38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  On a day when the speed of sound in air is 340 m/s, a dj nmx3c/u/09b:.ot . wzlrsobat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected r0cn/ 9l./t. uod: 3wmxsojbzback the sound?

参考答案:    
标记此题
39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You shout at a cliff:.)uzmd 8z)wz( qfixw, and hear the echo in 4.00 s. The temperature is $0 \; ^{\circ}C$. How far away is the cliff?

参考答案:    
标记此题
40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you hear thunder 5.0 s after seeing a flash of lightning, the dishl r0j h9,hxwx 6f/c3etance to the 6jc9re, lx wf30hx/ hhlightning strike is about

参考答案:    
标记此题
41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An echo is heard 2.0 s from a cliff on a day the tt8ge 1a*y v9vy3fvl5 uemperature is $15 \; ^{\circ}C$. Approximately how far is the cliff from the observer?

参考答案:    
标记此题
42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  On a $30 \; ^{\circ}C$ day, there is an explosion. The sound is heard 3.4 s after seeing the flash. How far away was the explosion?

参考答案:    
标记此题
43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You drop a stone into a deep well andvdzb1b)dx 2q. hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, av. 2)xdbzbd1q nd assume the velocity of sound is 340 m/s.)

参考答案:    
标记此题
44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The wavelength in air of a szs u rv(6/ikq b-2rn4sound wave of frequency 500 Hz is

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound traveling in air at 2ygsn) xalb m .5y n+/c6wkxx*$23 \; ^{\circ}C$ enters a cold front where the air temperature is $2 \; ^{\circ}C$. If the sound frequency is 1500 Hz, determine the wavelength in the warmer air and in the colder air.

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the intensity level of a sound with i:9kz e-8wgkdr g /8fpa z9 j7x1vi6tfzntensity $10^{-3} \; W/m^{2}$?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the intensity of a 70 in0ard, huqep2tt5ms,- zz- 2-dB sound?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the ratio of the intens)l;odt. 0qgk6sj9 qg : g/3gnzyawh, kities of two sounds with intensity levels of 70 dB an6o:ykz,l; n sg3qkw h9g0 g/)t.ag qdjd 40 dB?

参考答案:    
标记此题
49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity level by 15 engines in a garage is 100 dB. :r(is rvx:hn5j(/d+ iwiv /w0ifuqx3 What is the intensity level generated by one engvixhf:/w vsw:0 rii3nd(u 5i +qx(r/jine?

参考答案:    
标记此题
50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity at a distance of 6.0 m from a source that is hx qti-hqo* ve9(,utq- e6j(u radiating equally in all directions ise,tuquq * hth6o-( i( jxe9qv-
$6.0 \times 10^{-10} \; W/m^{2}$. What is the power emitted by the source?

参考答案:    
标记此题
51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity at a distance of 6.0 m from a source that is radiating fk.rd;6:folroig+) (n) gzsv equally in all directio)(vls): +r6.; fikz norg ogdfns is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the intensity level in dB?

参考答案:    
标记此题
52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A barking dog delivers about 1 mW of power, which is assu,ezlt.u.oivcyej))yt tcsn; l:*3 k2med to be uniformly distributed in all directions. What is the intensity levez*c ;, l k ):e.cslu.2vnt3)jeotyyi tl at a distance 5.00 m from the dog?

参考答案:    
标记此题
53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity level is 65 dB at a distance 2etgmf-*u)qr5 g di* f5.00 m from a barking dog. What would be the intensity level if two identical dogs very close to each other are barkinmire5df) -u**gt2qg fg?

参考答案:    
标记此题
54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At a distance of 15 m from a sound source the intey v peg 2e8f+jvj sm)/gv3j*q6nsity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates egsvp /63) * jg2mvqvjye8 +ejfqually in all directions.

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The sound intensity level 5.0 m from a point source is 95 dB. At whatwz+imkq1r4 k* distance will it be 75 k*zr i1q4m+k wdB?

参考答案:    
标记此题
56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The third harmonic of a comr hq3 it8rs ,:3suf(gyplex tone has a frequency of 1200 Hz. What is the frequen3ig( :ur8r h,ys3fsqt cy of the fourth harmonic?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of the third harmonic of an open piu c gnawfm)).1pe is 900 Hz. What is the length offa1g c )u.)nmw the pipe?

参考答案:    
标记此题
58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The lowest tone to resonate in an open pipe oy:i )gelg)*a dl9-1sm-vy6vi- 6uewwa riol:f length L is 400 Hz. What is the frequency of the lowest6)*vgre- 9lsi: a)iwg6ie-oy u:l1- v yawdlm tone that will resonate in an open pipe of length 2L?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An organ pipe open at both ends has a length of 0.80 m. If the jrpkqc6b t2u r p.)52gvelocity of sound in air is 340 m/s, what is the frequency of the second hat p r 5b2k)pqrg.cj6u2rmonic?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 3.00-m long pipe is in a room where the tempye-b )ym+eokvx 9;rzx6 )ed 7kerature is $20 \; ^{\circ}C$. What is the fundamental
frequency if the pipe is open at both ends?

参考答案:    
标记此题
61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The fundamental frequency in a pin j 8v67v1m+vv5-io+ kee 7s amgmmo:rpe closed at one end is 330 Hz. What is the frequency of the third harmonmje 5 os67 ev:+v7ki v 8mao-v+m1rgnmic?

参考答案:    
标记此题
62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the length of the shortet77pm5y 9x/m4hqeek ost pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velop m9kxe/ ye4m7qto57hcity of sound is 340 m/s?

参考答案:    
标记此题
63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 3.00-m long pipe is in a ro)6jbm/4efypatip,)ehu ugxsy +abl,,*v 7k5om where the temperature is $20 \; ^{\circ}C$. What is the fundamental frequency if the pipe is closed at one end?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 3.00-m long pipe is in a roomnj1sk e9q xww3tz:b -6 where the temperature is $20 \; ^{\circ}C$. What is the frequency of the second harmonic if the pipe is closed at one end?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A closed organ pipe of length 0.75 m is played when the speed of syx 3eq6cfn3bi t2-e5w ound in air is 340 m/s. What is the fundamental frnxc2e3 3ft6iq 5ybe-w equency?

参考答案:    
标记此题
66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two pipes of the same length: one 7bcja/ h7qgb e2ho2c,is open and the other is closed on one end. If the q7g cb 2,eh7/c2aboj hfundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of the closed pipe?

参考答案:    
标记此题
67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two adjacent sources each emit a frequency of 800 ;yye6vw8llw* Hz in air where the velocity of sound is 340 m/s. lw8yw ly6v ;*eHow much farther back would source 1 have to be moved so an observer in front of the sources would hear no sound?

参考答案:    
标记此题
68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two speakers are placed side by side and drxjasqm )*(9m uiven by the same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the personjasq (xumm9) * detects little or no sound, which of the following is a possible the distance from the person to the other speaker? (The sound speed is 340 m/s.)

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
标记此题
69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two tunes have frequencies of 440 Hz and 444 Hz. What is the bakawwuqjdvac1 x 6 vq;.*8kt i)+8y c,eat frequency?

参考答案:    
标记此题
70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A music tuner uses a 550-Hz tuning fork to tune the frequency of a g uoa fwrj3b29,rtcx0w6vcy-xm0 v0 2musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of t2wum3,jf9- x0vogw r2r tya6cc0v0 bxhe instrument?

参考答案:    
标记此题
71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The wavelengths of the soijd70syg d6a;dx/ u z,*vbnq4unds produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the hornsaix*67 b sd4g,/0 uvz;djqndy are sounded on a day when the velocity of sound is 340 m/s?

参考答案:    
标记此题
72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The corresponding violin strings on two vl rbvmw5;j(3u a:nn k:iolins in an orchestra are found to produce a beat frequency o(3; 5urv anjl kw::bmnf 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension of one of the strings would bring them to the same frequency?

参考答案:    
标记此题
73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An observer approaches a stationary 1000-Hz s4k bt:xh2au+s sf( gn/ound source at twice the speed of sound. Thtbf2agu+(hkn x :4ss/e observer hears a frequency of

参考答案:    
标记此题
74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source (norm5- bq4drh x*m: kp9qoial frequency of 1000 Hz) approaches a stationary observer at one-half the speed of sxb9q qk *-4:od 5mprhiound. The observer hears a frequency of

参考答案:    
标记此题
75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound has a frequency o1 zr.w2 * qhi8puyxpmx3 ja+.yf 1000 Hz. If a listener moves with a speed of 30 m/s away from the so* j81wh+a rx 2ypqm.pxyu zi.3urce, what is the frequency heard by the observer? (The sound speed is 340 m/s.)

参考答案:    
标记此题
76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A police car has an 800-Hz siren. It is traveling at 35 m/s on a day when the stu xgq 72;u+ybpeed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roadside. What change of frequency does the observe7+2 tq;ux buygr hear?

参考答案:    
标记此题
77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the frequency heard by a stationary observ, 1tt vx0kgl)urjws (y+to5ff 9mv4q5 er when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the stufvgf j kt1xt0y,o +w5(l)4 5s9rmqv peed of sound is 340 m/s.

参考答案:    
标记此题
78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling toward you at 120 km/h. The train blows its 400-Hz whistle1bpa (s mzzqv20wxc- :. Take the sp1(v -0b s2:zpczamqxweed of sound to be 340 m/s. What frequency do you hear?

参考答案:    
标记此题
79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are moving at 120 km/h toward a stationary train. The train blows its 4m0hfjelx71 av b91; d4ztl:ym00-Hz whistle. Take the speed tzjl;m19 d7mhx1v:b0fley4a of sound to be 340 m/s. What frequency do you hear?

参考答案:    
标记此题
80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling away 7( r:n,odvxd7 klcn)n from you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of so7rvnn,7 c (ld )k:dxnound to be 340 m/s. What frequency do you hear?

参考答案:    
标记此题
81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling away from you at 120 km/h. qx(hp 7i+n)ecuvd2,on8 j ph7 It blows its whistle, and you hear a tone of 4i p 7 j(henqopd8,x vhu+cn27)00 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency of the whistle?

参考答案:    
标记此题
82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of a train horn is 500 Hz. Assume the speed of sound in airx3z vu46t cfl(x 1 skfi;ay+2w is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the train with a speedxx1;i fc6fzl42w3kaust( + yv of 30.0 m/s?

参考答案:    
标记此题
83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of a train horn is 500 Hz. Assume the speed of sound in air i ltyqv/r 2 zhs:jvy2f 9yp:r7,s 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a sp:2:h, r l7y2yptvjqyrvzf/9seed of 30.0 m/s?

参考答案:    
标记此题
84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sonar is used to determine hkk- .z-evyu hde0fo7..6m n4ihv6 v ithe speed of an object. A 40-kHz signal is sent out, and a 42d k-4i6vm h-v e.zn7uofk0hve6h y.i.-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the object moving?

参考答案:    
标记此题
85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The half angle of th qp4z-zq430ey fs) pe,vp+ssne conical shock wave produced by a supersonic aircraft is $60^{\circ}$. What is the Mach number of the aircraft?

参考答案:    
标记此题
86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A jet flies at a speed of Mach 1.4.j7z9x i n15omu/md+,gx.pno y What is the half-angle of the conical shock wavjo.5x+ m9/ mnnoz7i, yxup1gde formed?

参考答案:    
标记此题
87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Concord airplane flies from the United Statesii8hlq clsf n,ujm :li;*0 o-/ to Europe with a Mach number of 1.05 where the ai o8m lih0*ls: q;/fi-unjlci,r temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

参考答案:    
本习题练习全部题目来源于51fly国际课程 (https://51fly.win)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
  • :
    •
    总分:87分 及格:52.2分 时间:不限时
    未答题: 已答题:0 答错题:
    当前第 题，此次习题练习共有 87 道题

    试卷内容到此结束!   © 2024 51fly国际课程 (https://51fly.win)版权所有

    浏览记录|使用帮助|手机版|51fly国际课程 (https://51fly.win)

    GMT+8, 2025-5-8 08:22 , Processed in 0.689741 second(s), 203 queries , Redis On.