无忧得胜-网上国际课程 (5edu.win)

 找回密码
 立即注册

 

      

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
本习题练习试卷来源于无忧得胜-网上国际课程 (https://5edu.win)， 为试卷打印版，您也可以在网站平台(https://autoconfig.5edu.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 70，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://autoconfig.5edu.win/test70.html  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。
 作者: admin  发布日期: 2022-09-26 09:56    总分: 87分  得分: _____________

答题人: 游客未登录  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 fal0wja r,p:g:4- lj3a a qtho-ljse 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 conducted faste 8,rifv6:z.g /hwhwyi 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 qk f-me4w1j--fa3,o eyz ac 5qin a steel 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 happens to the velocity :lb9w.k/mlzpm sr1m 3of sound? (39 / 1 wlsk.b:plmzrmmAssume that all other factors 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 velocf*b;fdj1 d3fje5 v g7hity of a 400 Hz sound, the velocity of a 200 Hz sound through a*g537hfjj ffvbe1 dd ;ir 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 wavea7np.1g c ja/zlength of a 400 Hz sound, the wavelength of a 200 Hz sound in airpja/ac 1 g.nz7 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 frequencies greater than 20,000 H9 3 mgpf0df 0tyasjk*4z 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 tha,b;2akxp 5yn9- xn/x i wn2yign 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 un7h6 sua fd);ahufo-k 3iformly in all directions. If you move to a s6fahfoa -ud k)h3 u7;point twice as far away from the source, the frequency of the sound will be

参考答案:    
本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  For spherically diverging z),*ky: uty o uq p*(ck+7s1qzxhs n9zj;,fauwaves, intensity is 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 )6:lzb; 4 eoht 5llwsfa distance d from the source is I. What is the intensity at a distanc; bfzl 4:s)holt w5el6e 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 qx jsbz+f k9/00b8btzv:7gctsound source that is radiating equally in all directions.+bq8 svbz00gjxtc t 7zk9:/fb 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 source that is radiating 2( t/mrrvh5 1ckv1g7yycdp -e equally in all direct 7 c tkv-cpgrvr1ey(y52/ h1dmions. What happens to the intensity level of the sound? It drops by

参考答案:    
本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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 inc;yz1 mnc 7nq0(2g,rxjd;ml/j6 b i9j tsaog2ureases 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 ah6 r5ww:b()raaya 8nl6y kw9mf ( pvx4 speaker emitting a pure tone. What characteristic of t5:(9wax rrwyfh vyl64bpa)(w86a nkm he sound increases?

参考答案:    
本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudn:dnec0 hzb0wo d: 2gg:ess" of a musical 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 "pit4d eblwy: riv mvb)r(01c8uj pp :6u6wch" 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 into 4 7nv)k f:ob6t0 -k ke8usjtmkwater

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 displacement w g 4ef3i: gy-3w8i +3qqztrksnaves 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 .hbx24 6l2vuf iy 3hxcstring and the sound wave generated by the guitar as a resulhcb fxhi226.vx 4u3lyt of this vibration. 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 bo18drueug8, s0zr6dy a th ends, 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 length L. What are the wavelengths of the three loe*lbh p5dld c8i+0 j7h: bhzr,west tones produced by this be +*lcph5 lhd0b : ,7rzdh8ijpipe?

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. Wmxnla:a1bp i6h-cg *d;dan qz1 p,1+ehich one of the following frequencies will not resonate in the sa 1d;a n:1 p*6i-gadpa ,bhl 1z+emqxncme 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 af0apg*mut9.a h 3gb3g t its fundamental frequency. Which statement is c9a t u3pfg30*bgh .agmorrect?

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 is open at onl 2lc*rw0 ouuot. u7j w:xj9w-e end and closed at the other, there

参考答案:    
本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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. Wha6yfs1z6j //euyve1c0 s vk/flt are the wavelengths of the three lowest toneskyfl s 60/scfevj11e / yz6/vu produced 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. jft;.eb y6ks 0,kp 7 ifad3gu:jt/ss2ghud/. Which of the following frequencies w;u a.2ydh0:k6gfgfu3bst jdet7s /i/k, jp.sill not resonate in that pipe?

参考答案:    
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 resonatind6fvp9e 9mp (yg at its fundamental frequency. Whiced(6 p9m 9vpyfh statement 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 dcs/5/6 dr dsv2n3ey)km -2ojq,xl qtoriven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day wo2e ) d-qyn qr56/,kjs 2xdloc m/3tvshen 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:    
本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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 sozkl/ n. * u4ovrg9mwkm ,6wtr5und 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 soy6 6hpu4wxb9v*my- rjunded together and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one 6*9r6wybv y p-u 4mhxjof 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 exp0zz5im )e.bcx s. iat8lains

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 statb7*pk (t0m ;yuuui2 mfb0u3c4j p*c niionary observer. The frequency heard by the obser4m3 02 nbc* ui (mckuf;ti*ypp7jbuu0ver is

参考答案:    
本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
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. ) k, busm)gt:x/t b6f,+l lgeuyhe7w9The frequency heard by the obg7kg/:)tl) u9whsfb xteub,y e +m, 6lserver 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 sut hmyg2-(4dy5gabm -d)8zg its MACH-speed, its half-angle will decrease by a 4gm yh58zdmsu g) y-(-dg2 atbfactor 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. qg ;t;nv0hi-jWhat is the avj;q;g h-nti0 ir 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 speed of so pr la3e1f/rsptg5 ud7qzpz 3+vj7q( ;und in air at $0 \; ^{\circ}C$ to the speed at $100 \; ^{\circ}C$?

参考答案:    
本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
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 u-rw:p 0,b,e v-;ltdcqf 5 conm4jmj9emits a shriek whose echo reaches it 0.0250 s later.-v,;t meclbuo qcj4,5fd-n 9r0mwp j: How far away was the 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 px(ek8ba w87 5b8 ucjqtemperature 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 fo7xk kjq5l ojz1t;r0. lash of lightning, the distance to the lightning strike7kqo0 l kz.xj1tjr; o5 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 uc inrkq4zkco 36mc9zh)-), h a cliff 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 lj* t7 *jnvw bb/g3lp1s later. How deep is the well? (Ignore aiv/jj 7ln*lg p b13b*twr resistance, and 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 sounb6ts*-:bd kmk, v2yi id wave of frequency 500 Hz 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 ar.kz*4i95vdr*o *y1mlx zg lj ir 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 with8 9 f9umvkikqla::ox. intensity $10^{-3} \; W/m^{2}$?

参考答案:    
本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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-dB d1j3k 34ek u )6khzrbbsound?

参考答案:    
本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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 intensities of two sounds with intensity le gqt9 1txka75,gp s,hdvels of 70 dB an1d,qsx 9kgt5ht,p7a g d 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. What is the inten)g7bcw,zjkp-ugevw4r- k 3 7vsity level generated by 4bu-cpj3)k7evgz g7,-w rwkvone 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 s uyzl99s22iifqq 4ie4ource that is radiating equally in all directions2s z li4fiyq994qie2u is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the power emitted by the source?

参考答案:    
本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
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 equally pz smma6 ro:q(.++nw fin all directions isq:sw++m6armo pn.f(z
$6.0 \times 10^{-10} \; W/m^{2}$. 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 assumed;um5l yptj;t9 to be uniformly distributed in all ;p; yjlut t95mdirections. What is the intensity 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 .dn)n n965ddi, yzxl:c ,tb yz65 dB at a distance 5.00 m from a barking dog. What would be the intensity level if two identical dogs very n,l cxdn y56:zdbt d)z ,y9ni.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 souruy+ptl6 ugi 7uy8aa9+ .brwr7ce the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m.u u6g8ria 7tybylp97w++u r a from the source? Assume that the source radiates equally in all directions.

参考答案:    
本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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 95.1 * vovgd7c z0vhfrt* dB. At what distance will it f0*vo .7htvgd zc r*v1be 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 frequency of 120di gi9f3s xcsbqr0++7zf gw/h(3 gia9ubb /s1 0 Hz. What is the frequency of the fourtq b 3gczs0 grswaf7+/1/(b3+d bfh sguiixi99h 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 904f8 u4wh,er*jcjx h8w0 Hz. What is the length of 8hxj4jh , *cwrf4uew8 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 of length L is 400 (b7:bgbzozdvj r5 2pb tk.-6ur0pb-lHz. What is the frequency ob.-rpbr752- vbdt g pk :u obl06zjz(bf the lowest tone that will resonate in an open pipe of length 2L?

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 0.80 m. yu x y8*ak ddgu;t/da) g,81ll If the velocity of sound in air is 340 m/s, what is the frequlltdya ug,)8g*ax;d1d 8y /kuency 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 th) qj (kn3 v/tbp9rtza.e temperature is $20 \; ^{\circ}C$. What is the fundamental
frequency if the pipe is open at both ends?

参考答案:    
本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
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. What is4 yz(axaau ,6l the frequency of the third harmon ,6ua a4xalz(yic?

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 one enk86xw2gqkb7b. byz9l)u w f)fd that will have a fundamental frequency of 60 Hzwyq .bzf6klf8k2) 7w ugb)x9b on a day when the velocity 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 wh/ awmhqt63s0 sere 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 where the temptq y/t2:va3dkerature 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 ai /g x-az8-omm(hywylt15 vj a-r is 340 m/s. What is the fundamen lhoa8wj -y- z(ay1tm-m/vg 5xtal 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: 9qii cd- ix++-be2nel one is open and the other is closed on one end. If the fundamental frequency of th c-+e9inxdib2-eq+ i le 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 y ) v u(*xr.j uc,.o yk:pgons4(ut5aq9nt9j lair where the velocity of sound is 340 m/s. How much farther back would g*us:4lkq(o jy ,o(r y9t )u5p t.jnnux a.9cvsource 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 sa t8 n15*/shc7nihshfqbllv-5nak- / ide 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 tn/tsb-hi/q nk* n8l 5 -1va5fl7hsc ahhe following is a possible the 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 is the beat fgi .u fkqer:34u11u(ied7fkprequency?

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 musical in4 nb (oqgsa(7cstrument. If the tuner hears 74qb c ((snoaga 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 q(l-8a+p gy9 rohz+a n. y8gtrproduced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity of sound i8h ny(glaz r8.9tp-o+a rq+ ygs 340 m/s?

参考答案:    
本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
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 aapp arj8 80bm9n orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. Wha 809 ajpmrpba8t percentage change in the tension of one of the strings would bring them to the same frequency?

参考答案:    
本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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 stationary 1000-Hz sound oly19 2 fsorym)bq m*6 s/o4qgsource at twice the speed of sound. The observer hears a fre 4sq61so *logo/2byy 9mrm)fqquency 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 frequency of 1000 Hz) approaches a stationary omdqw :,w /a gzm)zrg03bserver at one-half the speed of sound. The observer hears ar )/z:0m d,wzam wgq3g 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 li0ffjx8.d o4lnn-z b* istener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 340 fz 4in.*f xjlb-dn80om/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/8qqd)fh3rb30 p dnjmw3r(g4s;c f fz:e f,z3vs on a day when the speed of sound through air is 340 m/s. The car appb8p0h,v3 4;3m qdn (drs)3 qz jgfffwfz:ecr3roaches 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 stationary observer when e e 0du +b)3adtn6bz/za train approaches with a speed of 30 m/s. The frequency of thezdteab)/u0db +e zn36 train horn is 600 Hz and the speed 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- qw7wt8b, miymzgs-3 its 400-Hz whistle. Take the speed of sound to be 3403wgb8w zqst -7 -immy, 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 g u*3)y.t10kb noeixi a stationary train. The train blows its 400-Hz whistle. Take the speed of sot x*0o) 3i kgybn1ei.uund 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 from you at 120 km/h. The train wc+4)alc+oj*w5 cfdwttg1 .q blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequencycq+w*f1dj tcla4ot gcww )5+. 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. It blows its whistl cwm:)k0 d..opxc tqu du(3*xle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequl3dm.)ox0* q u(uwxck dt p.c:ency of the whistle?

参考答案:    
本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
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 speg p-l6zykn .j,ed of sound in air is 340 m/s. What is the frequency heard by an observer -j,6g .pynkzl if the observer 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 hornx2b2 br34nz jd is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a sper24 n2xbb 3jdzed 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 4thul3)7cq4c0vb e z uobject. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 34e zqh u7ltcv3u4c)0b45 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 conical shock waveez) 9 puy+/mwue92lw l 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 Mac wa7u/ro-lz 7th 1.4. What is the half-angle of the conical shock wave f7-r 7ua/ltwozormed?

参考答案:    
本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，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
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 wr ;k32kptb3z.h+qjk+la c4 it ith a Mach number of 1.05 wk+pbrj 3; qkk.2+tlct z aih34here the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

参考答案:    
  • 姓名:游客(未登录)
    •
    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
    本平台(https://autoconfig.5edu.win/)支持练习，作业与考试(自动评分)三种模式，群组成绩统计排序导出，题目动态变量实现同卷千人千题。
    如果您对本系统感兴趣，想加入我们或者想进行任何形式的合作，请加微信 skysky1258

    试卷内容到此结束!   © 2026 无忧得胜-网上国际课程 (https://5edu.win)版权所有

    浏览记录|手机版试卷|使用帮助|手机版|无忧得胜-网上国际课程 (https://5edu.win)

    GMT+8, 2026-5-28 06:50 , Processed in 0.610305 second(s), 204 queries , Redis On.