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 is a false stzty ;:9bj+.x yp4z mjjatement?

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 conducted faste drz25vpky6nwiml1f(c7 b-xco80y6 c st 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 stee5s/yy3btwn9jme p (tbb10g/ r l rod?

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 ha83se us1, 05zqekj mkeppens to the velocity of sound? (Assume that all other factors re50ek km1s8ze3su,jqe main 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 velo1*jjbdr/1g :r rglg p0rv 6g)tcity of a 200 Hz sound through air i g/bjp61rgtdg:r)0jlv r1rg* s

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 wavelength of a 200 Hz sound il/ qt0m5h/ lbfn air/h llmb/5t0 fq 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
7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequencies greater than 20,000 Hz arkx2e-u 2mux8d uv,c7(p z.kun1t0f shee5 ir9e 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 leme/6;qel+yfo ss than 20 Hz are called

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
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 uniform-wxxxd vdd be ;bj-j:3gan)9 3ly in all directions. If you move to a point twice 93: anjdbb v 3); -dd-xgwxxjeas 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 is proportion- o-g7sgkdg 1zal 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 d8va2 1 7panfgoistance d from the source is I. What is the intensity aava27f81gp o nt 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 dist 0dc: otzk;w+hance from a sound source that is radiating equally in all directions. What happk+w:dh c0 ;oztens 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 source that is radiating equally x3gd 6v(/kj sgin all directions. What happens to the inten/vxj6(gsk 3d gsity level of the sound? It drops by

参考答案:    
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 inc-2 x m d:dzt6w.6fwcgqreases as a sound becomes 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 emit/6bi ; ubit;bxky o89xting a pure tone. What characteristic of the sound increas 9;i ;b8kb/6x biuytoxes?

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 musical note?b /hcr 2:egc:j

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 "pitch" of a musical note?q5yxb 9u/ihc-

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
18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When sound passes from a3gzmy 7hv47 1i n(ubbcir into water

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
19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement waves nl y;wlce:-vdz;fda pi( ()(pare

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
20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider the standing r(yhr60 a/srg wave on a guitar string and the sound wave generated by the guitar as a result of this vibrat /arh(r0gy s6rion. What do these two waves 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 atwev1rk(mq d ) ;6yaa0a both ends, there

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
22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an open pipe of length L. What are the wavelengths of the thrh5wx5qcm qfbxlyj04 1(n-y. vcc6 ae8ee lowest tones pqcc4 85y-nyxm (echlx0fw.jb aq61v5roduced 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 open pipe of length L is kxxo mxbu x b,+1sc/21200 Hz. Which one of the folc1s mb+uk,x/ xo1 2xbxlowing frequencies will not resonate in the same pipe?

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 L is resonating l .ugq+dot,x3 8;p t)-svh ddeat its fundamental frequency. Which statemen3 ;d-)eovql sxdhtg+ud,pt 8 .t is correct?

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
25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a resonating pipe which is open at one end and closnr1sxu3v4+lc -*wd,ic cohu )lc+qh 0ed 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 length L. What are the wavelengths of the t3 c//f rrfsxe5hree lowest tones pro 5/cfxs3rf e/rduced by this pipe?

参考答案:    
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 length L is 200 Hz. Which of t5.tqgt nb+k aj6sglt) *pi kux4(;4izhe following frequencies (ttapbk *46ki)4qsjx zutn+ gig. l;5 will not resonate 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 e.,uqap at- e6end is resonating at its fundamental frequency. Which staau6 ep a,t-.qetement is correct?

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 same source. w7+- zkz 0 7jo2o)k8nufizkyeg:ekj: Each speaker produces a tone with a frequency of 200 Hz on a day when the swj+oj:k - ke yuzkzzi:)8 7feo n7g20kpeed 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:    
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 0xys7.ywaq: 9 i pv0hd.6(ckxnezp6 pbeats, the two sound waves should have

参考答案:    
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 particular beat frequency is hezgr87fb7l/rn zd2+ a/gqd o, zard. What happens to the beat frequency if the frequency of one of the ton87n drg,d/flroz/2 7b za zq+ges is increased?

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 exuua a+xy-yq 8)hkft+6 plains

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 stationary observer. The frequency heam7w5 romo2-hlrd by the observer ism wro h75lo2-m

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 freqlu6fcfhg:a/( qhs ee*qj6.:z uency heard by the observehqz.:6l6 e e *cff/sh: aqguj(r is

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 wi,ig,s7l6w. 3y drwtdha3 g+pxll decrease by a facto y ,7s,dgtlrg iwd+a.xph3w6 3r 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 fr9qvqbv z n68lan.3v(iequency 45 kHz in air is 352 m/s. What is the 96 bvnqv zqa3.l8n(i vair temperature?

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 speed7b /8vemh:om s+-yw d/knxgv4 of sound in air at $0 \; ^{\circ}C$ 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 bat emnwp(g 0yny/t2its a shriek whose echo reaches it 0.0250 s later. How far away was tht (w2 nypn0gy/e object that reflected back the 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
39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You shout at a cliff, and hear thwc- 9eg;*lbq;li7 arpe 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 lightnin q9 ygxs v1:dj93hvd-og, the distance to the lightnsg9yovx -vhj:1dq9 3d ing strike is about

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
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 t43epb 1lvust7f4 -wjji m1sl0g8 a2tcliff on a day the temperature 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 and hear the splash 2.5 s later. Ho(d 6e5wvo x6dlw deep is the well? (Ignore air resistance, and assume the velo 6oe 5dw6lv(dxcity 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 sound wave of frequency 500 Hz2xr)rb/wxvjyyho95jl 0 )rq1 is

参考答案:    
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 . vl4o 2,tjcpxdw*;6wg-lmc b $23 \; ^{\circ}C$ 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:    
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 lev a,w-x)zi 8mliel of a sound with intensity $10^{-3} \; W/m^{2}$?

参考答案:    
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-d5ia2of,gws e)B sound?

参考答案:    
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 intensities of two sounds wyh sci uy5;1r/ith intensity levels of 70 d5cr;yy 1usih /B and 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;1y -)cz r pg m-erge:x)wfgt( in a garage is 100 dB. What is the intensity level g-r epg(-fegt g)z:ywc) m;1xrenerated by one engine?

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 radiating eq:jyhgma y95 bl l)5 p.o-/cfqr hqeu.7ually in all directions ilo gu/jc l) yf yq-:b7qrep5.a9m.hh5s
$6.0 \times 10^{-10} \; W/m^{2}$. 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 mkkbd jh230 ,no from a source that is radiating equally in all directiodkj3b,n0 okh 2ns is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the intensity level in dB?

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
52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A barking dog deliver4eq8g6(jfup w /hd*gks about 1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m from the do g e/fhj p4kdw*u6g(8qg?

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 5.00 m from ax2h*pvaaf f-g5s i6 )(k3jw el barking dog. What would be the intensity level if two identicfp -lhv*i 3a(2 5se) jw6gfakxal dogs very close to each other are barking?

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
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 intensity level is 60 dB. What +9-r4 ither yas0xxv+4qcu r7is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source4 a xc+t7srr xvh-4u0ryqe9 +i radiates equally in all directions.

参考答案:    
标记此题
55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The sound intensity lwik01ki) c ; ;w5yqifyevel 5.0 m from a point source is 95 dB. At what distance willii 1q ; 5f;)kw0wikcyy it be 75 dB?

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 complex tone has a f.,zqz-wvdn p;g co zb e8de/,8requency of 1200 Hz. What is the frequency of the fourth harmonico d-b c,dpn;eqzzg8w. /z 8ev,?

参考答案:    
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 harmoniwysz2g1j0cx h-n k7z+0a,awy c of an open pipe is 900 Hz. What is the length hc+0n ak7j xaw,2zw1gzys0y-of 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 pw6. f*pkxm9l0w9uazopen pipe of length L is 400 Hz. What is the frequency of the lowest tone that will res*0 f9pmwx.u zakw p69lonate 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 lengteg)(f: .dyupu) fw8swh of 0.80 m. If the velocity of sound in air is 3w ud.:wgsu() 8epf )yf40 m/s, what is the frequency of the second harmonic?

参考答案:    
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 ). w)m nm/mt2cw bmujjhu05r2the temperature 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 pipe closed at one end is 330 Hz. Wl5w9qj8 fhravm ;j97a hat is the frequeq;8av7jr mj95wa9h lfncy of the third harmonic?

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 ofs(y6che/+fu lf1k pc5 the shortest pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velhc1 sp yulkfc(e+6f5/ ocity 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 room where 338pexlfs,t9n4he-per 0lua the temperature is $20 \; ^{\circ}C$. What is the fundamental frequency if the pipe is closed at one end?

参考答案:    
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 room wh)q8 arm3 yk ow2p51+yianlc0 kere 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:    
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 sound in s * e w+xkt rht16i/gcwg9-5hxair is tkrx/ce g w+g9*65 ht wxhsi-1340 m/s. What is the fundamental frequency?

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 is open and the other is clo7zvj.2dy 0 0n zczokqjds 7)m8mrdd12sed on one end. If the fundamental frequency of the open pipe is 300 H)0n771d ys0jo qdr m82jcz2kzmdd .vzz, what is the fundamental frequency of the closed 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
67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two adjacent sources each e8 -ba8 ;v/flkd h-frcnmit a frequency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in front of the sour- lh/ v;c88rd fanfkb-ces 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 blu ripxku:p neg 7*87*y side and driven by the same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person detects little or no sound, which of the following is a possible the distance from the person tprg 87 pu7xlnk* *ui:eo the other speaker? (The sound speed is 340 m/s.)

参考答案:    
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 beat frequenciz61tf:+ mjlqy?

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
70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A music tuner uses a 55p)-uwsmm-(2yxr 4nas 0-Hz tuning fork to tune the frequency of a musical instrument. If the tuner xua) wny4m-2 p (r-smshears a beat frequency of 2 Hz, what is the frequency of the 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 sounds e3 m*yuj5lc b y5m*d;88a:n8y lsu brbproduced by two horns are 6 m and 7 m respectively. What beu;s ycaey5rudb**8b5 jm:b m83ylnl8at frequency is heard when the horns 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 violins in apxk *qg19dsk (d 7blbked.,)i n orchestra are found to produce a bq,b)bkds7k(1il9g . exdkpd*eat frequency of 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 statiqt udc jtj-5pi7+pa7;r4qd e 5onary 1000-Hz sound source at twice the speed of soundd5t7 r7uap;djtc5e+-4 pjqiq . The observer hears a frequency of

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
74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source (normal frequency of 1000fco1uc3cz1r*gea 4zfwv,*k)g jw(jpmw5 m 76 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears a frequency ofrv 76e11gozwgmca kc ,j4 p)jcu*z fw*fm3(w5

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 of 10n w- l7rbyl 9fr *j96nvsu*n6)o9 xpyj00 Hz. If a listener moves with a speed of 30 m/s away from the source, whatr6 j *nlyf7yu6*p9)novbn9j9 lrs-wx is the frequency heard by the observer? (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
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 3e*e(dun dd9fhry ;i)xj 0 4mt75 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roadside. What change ohfdx9dt*( n y;ud74ie jm0)erf frequency does the observer 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 obsec(je k4 f8eic(rver when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the spee( eifce8jc4( kd of sound 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
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. ojwv s9;m tyzm3//l 8hThe train blows its 400-Hz whistle. Take the speed of sound to behvo 893z /t;j/m ymwls 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 km5pt486kjs2tebb:c hi /h toward a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you p5 8 kbcthi 64:jestb2hear?

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 from you at 120 k/w/.4ju x2l7fn9 ba6vlv qmkkm/h. The train blows its 400-Hz whistle. Take t/jwbmvlvl9x n /q62a.kuf4k 7he speed of sound 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. Iqpu-i /rxa:tt .f+f j8t blows its whistle, and you hea8tt/fpu.+i rf:j- xa qr a tone of 400 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 souncmw-pcjvvr+am6u c5o v8r; . 2d in air is 340 m/s. What is the c+ cupj2 v6 ;5r.m8c-vvormawfrequency heard by an observer if the observer is moving away from the train with a speed of 30.0 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
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. A3q3eqm lre44 essume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaeq qee3rml443ching the train with a speed 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 the speed 1lry7xba* js 1 hsdq7f7h(6mhof an object. A 40-kHz signal is sent out, a7xqr7s hbym16 1j(fh sal*h7dnd a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the object moving?

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
85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The half angle of the conical s6h,5znry*dp i m-fo r/hock 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 ohalzjsj.b4 8v8zg odd+ *9mz+f Mach 1.4. What is the half-angle of the conical shock w4mjg v h s8dzb+l8z*da j.z9o+ave 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 States to Europe with a sm5 8h)-mdlrz Mach number of 1.05 where the air temperaturerzd)sl8h m- 5m is $5.0 \; ^{\circ}C$. What is the speed of the plane?

参考答案:    
  • :
    •
    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 08:14 , Processed in 0.463379 second(s), 204 queries , Redis On.