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
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://51fly.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://51fly.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: physics  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 falseyf51: (po mtsp:3i hpt statement?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.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
2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In general, sound is conducted fastesyaj8( 4h*j0:iqwzxohc: cn 0gt 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 swq 4-w qrypv4.xv7e ;tteel 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 happens5dv2guw, ixy 9vy: i0s to the velocity of sound? (Assume that u,x gswv5yi0v:d 9iy2 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 velocity of a 400 Hz sound, the velocity na. r8vy9u wdb b*j2.zw1:oghof a 200 Hz sound through air is y:u j*nr9.gbzb82hd.w voa1w

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 au0 ye r7djiqy)xs+5m , 400 Hz sound, the wavelength of a 200 Hz sound in ai my)7rds+j0i5yuq xe, r 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 efg7 2(yu2gdr 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 fcotwq8t tj1 ,r -xf-sfso 2g7)requency 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 all vl a0j er9;2t9e rp* 3kxo-cvpdirections. If you move to a pointe a*e k-ovrtprl23vjxc ;09p9 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, i;k rg* q+rrgp)ntensity 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 a distance d from the source isj,f97 enw8g xu I. What is the intensity at a distance 2d from thux78 egjf, wn9e 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 (a7vp 1vb+mng4urr 0 tn t/ok.that is radiating equally in all directions. What k0/tv. 7ounra(1mvg4bt pr+ nhappens to the intensity of the sound? It reduces to

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.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
13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You double your distance from a sa)tt:gczie j9 b8- r12eiv u5*ilzn:nound source that is radiating equally in all directions. What happens to the intensity level of the sound? c5e:rijbzi8)i-u1 *g 2v9nntl: azteIt 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 a sound becomes loud mp+ m;8mstu g dsl1r(d4(i:pier?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.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
15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You move slowly toward a speaker rr j5ck nu1w1p*ti d8f4cs /6va2gr1femitting a pure tone. What characteristic of the s5*r/164n vgra8i1 w f21 kdcpujtscfround increases?

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 jxf ))k lkm-,7y +g;a( jkqqmwmusical 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 "pix,;a, 1 qwuxttk dox:;tch" 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 ewxe3+/p2rci water

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.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
19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement waves -vnfoo;tc*x; 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 wave0a x aj.6;m fuxr)6vuq on a guitar string and the sound wave generated by the guitar as a result of this vibration. q6xfram.)xu ajuv;6 0What 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 oa6nuk5;tj)i-ndi8jn pen at both 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 Ln0bd 4elq8 n5q. What are the wavelengths of the three lowest tones0n l4qn85qdb e 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 open pipe of lengtqoi f56 8vrw ao/m5a of:qbea9a1ce1j vmi-:4h L is 200 Hz. Which one of the following frequencies will nob5 eaav4 1owe 18fio-c i5:r:of9avm q/jamq6 t resonate in the same pipe?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.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
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 fundamu agr8oj4)vb vgo)z7g8cx+ *bental frequency. Which statementv x b*jgou4a ))g+ 8zvbrco8g7 is correct?

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 , 54u6dmj;em 2ei77ccxzwe vxis 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 length L. What are the waveleng)97z:sxlm)tfu 6w18 optyc pyths of the three lowest to6 p1csx 9)zyf o8t:lt7)mpwuynes 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 i 7zmhc,.rxs7hwk1g (length L is 200 Hz. Which of the following frequencies will no hzr1i7mk s.7x(,hwgc t 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 closhibr)5- vsg wj w*kwvzp.k0( 1ed at one end is resonating at its fundamental frequency. Which statement is correct? .s-0rv(vwj 1* kizgk)w5h wbp

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 speaker(1rss:whcj b :s driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sjs(r:cwbhs : 1ound 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 beats, r0oxet0( nsq(9v v.oythe 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 sou/ hd.;8vp2jfo1 wcsrunded together and a particular beat frequency is heard. What happens to the beat frequency if the frequency of .uvf2;81 hjwpr/ocsd 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 exs3:+l.s xkdmz, t zs-gplains

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 observe(dkvxrtl* *id(2x7b3ow ff h 0r. The frequency heard by the observer i(d*dv ix*32 (ktb0xr 7wlffhos

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 hexf;1caga+h r*a + 1v2f:x zykward by the obsea+za x 1ywf;:*h2+v1 r xagfckrver is

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.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
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 :ph*o mbs e9m6half-angle will decrease by a factor 6m9opshe:*bm 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/sy-kkz+tq7y.,z -hgl h:g k bq,. What is the ai.ty-,bh: 7 g kqqz khkygzl+,-r temperature?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.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
37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the ratio of the e j5xy4dazd 0+speed of sound 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51fly国际课程 (https://51fly.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 speqg)+/xlsc2qjw m 3i/ht; vsm-v+ v4u wed of sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. Hog;qw-)xivh34m+ lvc//uqsv2m jst +ww 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 heaop2q4 w i06xwor 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 distance to toy6*xbsuqkt4kt q-* :he lightning strike u6k kqbs4tx*-q*:y to 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 cliffjg; a :gn /dx:l1m yvyzq+88tn 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 a -jwqw(pkpmtv9ul1*jvx69nm1 -e 3a+g ajs * hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the vewjpajn+auk*m* sa xq1p-e9 3-l(9 wjmg t1v6vlocity of sound is 340 m/s.)

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.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
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 fr )5 cd44a3b.myvckgqu equency 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 a5*5que /x z1tpzy7jo; h qv:w8p83e5 sjfb ogeir 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 wi rxy 1a8.:bn/ lqvmy(4ivu)x sth 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-dB som ey 3)y*btnmzkwb85)a h 8.dkund?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.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 neb1nksf pps 75r5 2.tmy*/k cintensities of two sounds with intensity levels of 70 dB and*r 2s1pm ysb kpen5kfn5. t7c/ 40 dB?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.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
49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity level by 15 engines zn0 06bw rt:mrt uf(+gq ih:-jnb8;xoin a garage is 100 dB. What is the intensity level generated by oi 8n;quh bnb0(-xmzt: ro j:6 tgfwr0+ne 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 equallyj),; o hiuwl/f in all directiouj/i)lf w;,h ons is
$6.0 \times 10^{-10} \; W/m^{2}$. 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 frompo98ohh+i9 td9x lux - a source that is radiating equally in ah+i 9h9u8 9pd oxxt-olll directions 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, whicho 238sqtr:u c 3kts/do is assumed to be uniformly distributed in aoksd83 soq3/:r tt2 ucll directions. 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 65 dB at a distance va lvg n i,)emn*,rao56 zu2z65.00 m from a barking dog. What would be the intensity level if two identical dogs very close to each ni, *a5al mu zz62or6gvv), enother are barking?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.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
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 d:/jd okvm)ndx9j ivhqe1k8 ;.B. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates eq :9/oq;d evd 8kxmj.j1iv)nhkually 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 what distance )0wzs14o sasxbx w2l(will itoxlazb)sws(0x1 w2s 4 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 frequency of 1200 Hz. Wh p5fd:aw ,, n jbzmy8b*:izq9bat is the frequency of the fourth harm9fpbya w*iz :d ,qzmj,b5b :8nonic?

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 thirq33i,)rr am2vqt b td4d harmonic of an open pipe is 900 Hz. What is the length of the pipitad 4rv)r3tqq,b 32m e?

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 ihybh3:p8pvfemzwgcjo3,: x 03c o a;5s 400 Hz. What is the frequency0ab3zpmh , :yweh3 p83c :g;fov5cjxo of 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 leng.mzt/m leqt6 uon3ro2el u49+th of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the second har.e+m43l269r/ zqumn ueto l otmonic?

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 wher7xp7yd5b4s u (gvkfp- e 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 cl ,yugopu 96 m(q,/luaqosed at one end is 330 Hz. What is the frequq uaoyq9mug(/u,6 p l,ency 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 one end s:.zd e*xi 6uugxr2ki)yj 1h3that will have a fundamental frequency of 60 Hzy2rd3)jzg eshuu :k1i*x.6ix on a day when the velocity of sound is 340 m/s?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.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
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 temper-:+rx9j cyt)b w mx/bpature 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 temperatv ls01,w 30ek*ip:i/fubjl.u/ 1cpg-nfu vth ure 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 s dxbq.f ,zj4 e9*t ob)y6e.qjhpeed of sound in air is 340 m/ qq dxjj 9h,tfz46bo .e.)e*ybs. 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 op /7nboea oadx *bd5s4.en and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, wh *o abd4n7/xs5.badeoat is the fundamental frequency of the closed pipe?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.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
67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two adjacent sources each emit a frequencbr,b:fjzj k .d3+8s wry of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would sr :8s,rfz+b d3.wjbjkource 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 driven by the same frequency of *ahb*dan.o f8 500 Hz. If the distance from a person to one speaker is 5.00 m ob haf* .8adn*and the person 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:    
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 H h*37vanjj/7eua8jc z z and 444 Hz. What is 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 t 2z(ys(- ranqauning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is qa2r- ya (zs(nthe 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 produced by two horns are 6 m and 7 m respeypzfg r8iqz9 du06ux5 k) za1*ctively. What beat frequency is heard when the horns are sounded on a day zz6gk*i0) ydzr 8xfuaq9 1up 5when 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 an) hp*dnz*1 j;fnwb8d v orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in th zd18;vwh p b**djnf)ne 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 sound slxd1/z .v9.ce 8xbyvbource at twice the speed of sound. The observer hears a frz8 b1xb yec/v.l9vd.xequency 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 +.:fhtp l9w dtc3/vlyj jxm,vuo/g+2frequency of 1000 Hz) approaches a stationary observer at onemfttu+9jl.ywod +pxjvchl,: v/2g3/ -half the 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. ,,xkhii+)yhiy2 p zr hip /a1+If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 34h)/ 1hy x2+rzi ,,kiah+ippiy0 m/s.)

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.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
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 onqdm7qj4a l/3,u+bz sf a day when the speed of sound through air is 340 m/s. The car a3zs adbul7 q jf+4q/,mpproaches 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 st 1q0bn ylni:9kationary observer when a train approaches with a speed of 3bnk19i: 0qlyn 0 m/s. The frequency of the 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 blkpo +g3z80dofa 2h4u oows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequencyo2o8 pk4zah0+fo d3gu 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. i.le t 2(;udrj) mvw8mThe train blows its 400-Hz whistle. Take the speed of sounl8t(i mrdv m.uw;e 2)jd 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 12+ki k(- psw3nj0 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What k+3sw (jkn -ipfrequency 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 tz,onf01 /vzvdhd7 2lk(o2xosy)w;d km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What isv/72(s;z2 ,fo0)wov dh1nlddxkzo t y the actual frequency of the whistle?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.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 speed of sound in air is 340jz) 8 hb5d*rg8tpwhn . m/s. What is the frequency heard by an observer if the observer iszgw rdjt5.p8 *hbhn8) 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 sound in air,+uql on97vcs4k f v.j is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speed ojfnk4q vvlo,s.7 +uc9f 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 dete*giz-1mtx4c kcw t 6jitz0 r59 fs.*farmine the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is retums9ta0xziitg1r. 4kc**t5fz c -wf6j rned. 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 conical shock wave producedgf:rhy e1g:;jd,s( rc by a supersonic aircraft is $60^{\circ}$. What is the Mach number of the aircraft?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.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
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 oboj*srm1(sadu3 r 1* 9adlk 7is the half-angle of the conical shock wave o*9s3(ua7bdlms dr 1rj *1oakformed?

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 Europzs-10wo w+yo ve with a Mach number of 1.zs o +vw0wo1y-05 where 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://51fly.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 51fly国际课程 (https://51fly.win)版权所有

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

    GMT+8, 2026-5-6 19:19 , Processed in 1.272204 second(s), 215 queries , Redis On.