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 fav q/mria nzuyxf8xrq-j6g4 :h8 -y ,c9lse 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 con/; dbj8i59jlzklpr+twar;z2 ob* : i lducted 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 stec96up / gk7mvn3 nrqpu ,)qoh4el 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, whatn 2xkkv ryfzn)5p/(k1 happens to the velocity of sound? (Assume that all other facto1kpny/r vkzkxfn)(2 5rs remain constant.)

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
5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the velocity of a 4klo) *7smo *el u7lc2u3+pw h(ly 3xp.io7tys00 Hz sound, the velocity of a 200 Hz sound throuymlsyp7l ukx7su+co32hwo*)l .7(li* o ep3 tgh 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 wavelet g/7qae 9ku:lngth of a 400 Hz sound, the wavelength of a 200 Hz sound in a gt9:/ auqk7leir is

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 frequ3k oj nsx(0e4)ler i*tencies greater than 20,000 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 frequ, 81t7j/p: qv 5rahbgp g se1ammaa.y0ency less than 20 Hz are 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 ixk5y,6 ufbl( all directions. If you move to a point twice as far away from the source, the frequency x5l(f, u i6bykof 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 proporq. bh-mo:r9kg2+w j lftional 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 the source is I omo.x d3lmto328m2wb. What is the inttmm 3b o xwl8o3odm2.2ensity 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 from a sound source that is radiating m +s k6iznm2ryt0z0j 7equally in all directions. What happens to the intensity of the sound? It redusri2nz y 0zm70+m6tkjces 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,2:q s)h-dgbdh /10p thhr hqd from a sound source that is radiating equally in all directions. What happens to the intensity level oft /d1hdhq rd bsq,)h0: ghp2h- 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 increases as ;po1 eecu3z1e7q 2r rra 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 emitting a pure tone. What characteristic of t-wq;1imcf 5vkhe sound incrmck-5 ; viwf1qeases?

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 np,7vams:r9xgfyt e ufg2:/, u4 v.tzdote?

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" ofnr sc.m+i 8z qwrl; 3mwp//7mb 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 fr7*)anbm p q6b eb0(np8efxj.eom air 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.8s0 o9 t 5ykft1ljcje 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 and the sound wave generated by t ntu3mlxnw 8ulb/r6 a4j:9/5xv cdwj0he guitar as a result of this vibrlx:0bx3u6untwn/ald w v jm/cj r8495ation. 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 at both ends, there;lkepxc1sc.oy r-7cke i8*b3e 8m3bm

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 length L. What are thw7 r p glli0oi//;zjc(e wavelengths of the three lowest tones produced by th;z(lwi gj l/o7 r/p0ciis 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 200 Hz. Which o/1sf,a6vwrw.xtmkfw7v 5i -f ne of the following frequencies wft 5 vms,67v1r.fxf/wa w iwk-ill 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 at its funhj3zp-e+-kwj-. y n7i ,c dsfmdamental frequency. Which statement is corimd7j,3jspnce- zwh--y +kf .rect?

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 closed at js1+ln- va 0oz)jtx/ hthe other, 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
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 threcj( a7vbsp*q *:/ jrnme lowest tones produced by *(/v7nmrq ab sjc* j:pthis 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 clo mai4njn2 0 5y)zew7imhk-vx g();rlxjw9k2fsed pipe of length L is 200 Hz. Which of the following frequencies gj29a) 7f jk4 ;-2)r 5znemn0wixiylv(mkw xhwill 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 end is resonating at its fundamental fre6yo3zkv- uc:uj5gmpi4j f v5.quency. Which statem-:ujf kzc36o.ipyu 5jv4mgv 5 ent 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
29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A person stands between)lfxi8ahu*-;i u zja q68fea+ two speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The person i q; i au)6za8+eaxl -*fhfuji8s
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, the two sound .d 8+yl 3y2gqim vmjx-8rv:vowaves 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 7)hsehv ow*d q(dg d:9y v-9butogether and a particular beat frequency is heard. What happens to the beat frequency if the frequency us* hy(q gvde7:hv- wd9o9)bdof one of the tones 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 expl74b ij oopb7h2ains

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 head t-+p,5midfvbc k39 )jvztn6 rd by the obsefjcipmz9k dn6vd -t)5v,b3 t+ rver 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 frequency heard by thskz1q,dezh08o,r(j l;g,hl w ,6(j hva smh1v e observer l,gwsv(;q,,k 6j hje ,mo1zsh dlha0v1(zh8r 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
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 dect a9 tr7 mec3ta +it,zcw7d:k1rease by a f7r ct:,t dwc 19ki37 et+aatmzactor 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 f/9t, )v:ixr-xqz f yd )g(dxsknbc* *air is 352 m/s. What is the air te(n9cik*/dxf d:g fbt-rv sq) xyz x,)*mperature?

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
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 eq qrc)0j il*9o1e92qu+weud 4 nias,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 emits a s-m2sdlfe 4:hv 9abz -bhriek whose echo reaches it 0.0250 s later. How far away was thb4mlb2vs: 9- af-dzehe object that reflected back 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, and hear the echo in 4.00 s. The +jfq6: ldmzt2temperature 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 dist cax*05t msfw6qqvw5*ance to the lightnin fsq6* wq5cwtmv0* x5ag 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 tem/6)a8z/3ybhhhf l **y xydyswperature 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 dowu3hq5,7:ccy c c1,f+ fyzsdeep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of soc+c,o5 d y37w ,f:uc ys1qhcfzund 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 50fbphc1i1ov(/xx++n5 gqq q es/(x oa2 0 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 aihb4fb+7 hymz k0s9 ;hcr at $23 \; ^{\circ}C$ 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 level of a sound with intensity mav-r ;) tay)9lhcabz;2-l u r$10^{-3} \; W/m^{2}$?

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-dB souc8 h6r8ubni *fnd?

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 inb h*2. ,hnbx6)d 5hj gtqq8jomtensities of two sounds with intensity levels of 70 dB and 40 *2t,oh.hq6d8 bgnmjj 5 b qh)xdB?

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 byz)l q w8yb)rk5 15 engines in a garage is 100 dB. What is the intensity level generatel)rw5)zb y8q kd 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 equally (mkq4lq f+bc/ in all directions i/4 cl+qmkb(qf s
$6.0 \times 10^{-10} \; W/m^{2}$. 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 tha1ks6wtw37 gd9:rdqe l t is radiating equally in all directions e rtlkws1: w9d 3d7q6gis
$6.0 \times 10^{-10} \; W/m^{2}$. 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 assum catz 2bm:rhqwt/20p13rhju 2 ed to be uniformly distributed in all directions. What is the t3 zub1h w0r:p2 rqj2mca/2thintensity level 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 t 94fch-vjh4 wdj;5 zi65 dB at a distance 5.00 m from a barking dog. What would zh-j9wij ct54hvdf 4; be the intensity level if two identical dogs very close to each other are barking?

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 int a3dkhl .9o sxszoq+4,ensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the so los+s.9xq3dzko 4,ahurce? Assume that the source 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 level 5.0 m from a point source is 95 dB. At whatj ;8z g7aa ngs0)v u*6r:srmtg distance will it0 gnur8agj6) rsgm; zsatv 7:* 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 coml7iq4;*wg l+z0s;hyoi -kejcplex tone has a frequency of 1200 Hz. What is the frequency of the fouyjoc*l- 4h we0 kqi ;ig7;zs+lrth harmonic?

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 harmonic of an open pipe is 900 Hz. Whaetk1n;n zfj98 t is the length of e;fjz18tk9nnthe 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 of length L is 400 Hz.uv-c0 :h8uaj 0mud5wc What is the frequency of the lowest tone that will resonate in an open pipe of length 2L?-u5u wamuc :j8d00cvh

参考答案:    
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 0.8lgzt;3)7t l n v76blpcs+l-ow0 m. If the velocity of sound in air is 340 m/s, w;3+w)l7zo b7-vttlgs6 ll p nchat 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 oqvi4gpmg 6 ds-(;8 c8 4cksmqwhere the 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 x q5fgpr+6 w1kone end is 330 Hz. What is the frequency fg k5pwxqr61+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 of the shortest pipe closed on 08r9*scj8eryt;bw-kkiafkf+x+h.wo ,lt + tone end that will have a fundamental frequency of 60 Hz on a day when the x.kr;-l+bt,8cyk9* f0ka fwt+ie8jw sto+ rhvelocity 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 the te )vl9 )vuriu;9l li45k ut7cwimperature 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 where the tempev0arq1:y7*bmywwbf8d y* pk 6rature 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 7/q2okqeq+ ln length 0.75 m is played when the speed of sound in air is 340 m/s. Wlq7oe n2+qkq/hat 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 leng;*h ;(rqs 9x svpav7ynth: one is open and the other is closed on one end. If the fundamental frequens*vr;q7vs9 nyhpx; a(cy 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 Hz in air where the velocit, 7wd*82g;drc yp3og +jcwafly of sound is 340 m/s. How much farther back would source 1 have to be moved so an observefyr c;3lw agw +8p*j7,2odcdg r 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 driven by3 s5jmab7gw76t 1grxkcb8 k/y 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 t kt65s1 g 7 7gyckbaw8j3xbm/rhe distance from the person to 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 iixl0zqbg8sf )u/ sa7)( a l+;lkud3ors the beat 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 freq 0.gd;wu-el 3qdl7qyhuency of a musical instrument. I.uydeql qw g7dh-l03;f the tuner hears 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 soundsbbyuy4-rm5j*0q .h qz :,xaf y produced by two horns are 6 m and 7 m respectively. What beat b.0ujy*zy- x, hq54yb:rqfma 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 tkuir 0:s nlztv;c6 +o.wo violins in an orchestra are found to produce a beat frequency of 2 Hz when a fricl st0+. vro; 6nkuz:equency 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:    
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
73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An observer approaches a stationaro5khn:-bj6m uy 1000-Hz sound source at twice the speed of sound. The observer hears :nbhj56okm-u 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 (normal frequenaulm:o+e 3yu- xwhu/u ox7qei+a 60p6 cy of 1000 Hz) approaches a stationary observer at one-half thehxuu-+6u7lqoaweua /m30: oi+ 6pyxe speed of sound. 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 of 1000 Hz. If a listener muw;pbdku l3 5(oves with a speed of 30 m/s away from the source, what is the frequency heard by thep l(5u;u b3dwk 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 t+ s*zkl1-0kwc ittr9 jraveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car apprcwij*k l0t1stk 9z-r+oaches and passes an observer who is standing along the roadside. What change of 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 so 7ode p;i-.tbtationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the sb.dtp7oio e-;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 x j l6,ggdlk06 uk2 en+d2x8bxtoward you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequenx0+,jxx6lku 6ge2b 8n 2lkgdd cy 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 400mq7nzu z0t /l-0a3w af( (wx;qfi,iit-Hz whistle. Take the speed of sound n(t x/fw(0- 7uw3fai ,imz;0lzaqtiqto 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 from you at 1208rwu .n) v3rtl km/h. The train blows its 400-Hz whistle. Take the sp3wurv.n )r tl8eed 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 c sa+-x;m;mzyi2hj 8jrtt8z;at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 ;mzt 2xmj+8hrz-i ; sa8cjy;t 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 hc)u27 rlup.iu orn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the .lcu) 2u irp7uobserver is moving away from the train with a speed 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 0f zr vkhryih rr,q: 1 rgvd,dx-9(0qxz1e1*osound in air is 340 m/s. Whahi dy,1dkvr, qx1fzzr :(00*hrvq-xrego 1 9r t is the frequency heard by an observer if the observer is approaching 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 of an object. A 40-kHz signal is seo2gp 34v2s78tp sr bruox 18otnt out, and a 42-kHz s7 stboor3gt2 2 o8rup18xv4psignal 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 the c*0;jp(qro hxconical shock wave produced by a supersonic aircraft is $60^{\circ}$. What is the Mach number of the aircraft?

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
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. What is the half-angle of the cb snr0, ts)+o9pczcz. i3vbk:onical shock wave fo p zb t+i0z,:kcs.n39vocsb)rrmed?

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 Maqukl:u k4)km;v6spo.fy5m3 )kw ; pkjch number of 1.;j.k)s5kw;qu kmv ):6uk ppyo43 lmfk05 where the air 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 07:40 , Processed in 0.493843 second(s), 204 queries , Redis On.