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 ag(; uj-, x/lkbq yl9rw9s0vpa 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 c5c, :)ifk8kz(nxfeg ) xisep*onducted fastest through

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
3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the speed of sound in w:*4 ef776y :2*r wbmcirx7 kowinkc ba 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,hmi;hj 7w*)8:ew fe islw; d;t what happens to the velocity of sound? (Assume that all other factor iewei;l)dwm;:w h; 8*jh t7fss 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, th/vkiypaq3r ::e velocity of a 200 Hz sound through q:r/ypa ik3v: air 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
6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the wavelength of a 400e b8l 60:n zwhj)nwa+y Hz sound, the wavelength of a 200 Hz sound ie:6baz+ nyw)0lwhn8 jn air 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 Hz are c0x f -osta1t;bijwo2o xzv0-u l75zw+alled

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 thaz;,6xwb9t f 6bubx)hhn 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 emittin6.m xg*wb-v*ueqktri j do.,6trhlf. :gr8o,g waves uniformly in all directions. If you move to a point twice as far away from the source, the frequency ogu.o-v:t,mdq x6..e h,*i* w8r6 jfrl trkbgo f 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 propon v hfvw0j7d-ao-re.1w4 wj*yrtional 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 sol9:zr+k3tjqq v ;k+ tmzv+w0murce is I. What is the intensity at a distance 2d frot:v9q03 ktmqj+klzm r +zw+v;m 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 distancestmaxe (n--gh gsr -3,:skkv1 from a sound source that is radiating equally in all directions. What happens to the intensity of the sound?ksv1-nkhxs3 ,ga(r:ste -g- m 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 incmr, a8wm7ojd(h2ms *k n.5to all directions. What happens to the intensity level of the sound? It.km hr 75w8*scod2n,at (mojm 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 lkszmf):yp id 6dqi*ek4 :*y9 as a sound becomes louder?

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
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 pur x;moq/s (w 1 u yfzb0srel(.-zlq (2tbvmu59ne tone. What characteristic of the sound increaseo/lwzr01((qbmf5s s2qvxt;yn-u9lz um e .(b 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
16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" of a musi/ot*y f *cw:*mnsgbg:cal 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 "pitch" of a music,rfyva,g )va5q) ;azeal 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 wate 8 e,mkpk d,,ubkrbr30r

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 waviog-qyz()v zhxlg*jx -h ;-5mes 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 z;xx9t+; wlaythe sound wave generated by the guitar as a result of this vibration. What do these two wavxxa+lt; wzy; 9es 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 end e, eh/z szhc8dz)b8v+(h0lins, 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*/-ytba.m)af qwa bqw-6ku9 k length L. What are the wavelengths of the three lowest yk*f /)w-umk qta96qw baa-.btones 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 length L is 200 H,50c.t bdmhf xjcq j,,z. Which one of the following frequencies will not resonate0 jtcx ,c,j,qmb.dh5f 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 fundamental frequency. wc3jarhw+-pcmgc3()vumf - 8 Which statement is wc()h3gc+c r w-apujm3 -mvf8correct?

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 one end and closed at the ot4q z,6ftmj8 u grra/n*her, 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 lengthz7esvyry st09:3pq 6z L. What are the wavelengths of the three lowest tones p6 zvyspzstq9e y 0r37:roduced 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 200x r4o8w1 otz,d, i+mkb Hz. Which of the following frequencies will not red x,mrwk ob81oi t+z,4sonate 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 closetcxnft-h*nd0 3 w29y sd at one end is resonating at its fundamental frequency. Which statemec9 x 3y2hnsd n0wtft*-nt 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 sama.zfu)m:i(hsi nl0rm+ 3 t/pce source. Each speaker produces a ts a / u(p)in3frlz0mc.+h:mitone with a frequency of 200 Hz on a day 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:    
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 soun43m85-fj uvl/ ydtk wld 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 particular beat freagr6o3t5z02u wy mawhjv5y3 3quency is heard. What happens to the beat frequency if theuh 23wvgyrawo aymt 33z655 j0 frequency of one of the tones is increased?

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
32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift exp c,eik7 /v.hbslains

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 stationac 34am. g ydl/t(qes;jry observer. The frequency heard by the observerj4 g.l3;y sd/(aeqc tm 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
34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source departs from a statifgy,9 c:/i5 rym.hsmyonary observer. The frequency heard by the obser:i/ 5.cg ,hrfy9yym smver 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 M -ond-ta*cf)egkx)5 b -u +rapACH-speed, its half-angle will decrease by a factc)pr dtnaag -5*kubf--)e+o xor 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 35215wx ;i n ow/mb xsy;ypb-b-h1 m/s. What is the air temperaturey-/1b;owx iwhsp;b5mx nb-1y?

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 twjogr ic 4qkq75 sk22o x0(8wair 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 bar;lrhkm.u-;b/dim -x 9jxvl4 t emits a shriek whose echo reaches it 0;- x9 i .b xlkm/4rjrvh-;dlum.0250 s later. 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 .km* :kp tnh0cjc3 ;sy1p9y mqthe 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 distane 3lvrwsifs 0lb;+g; 1ce to thel + ;3;0lsrgfves 1wib lightning 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 dw 12;ifljz+* t7k(erkwo qil3ay the temperature is $15 \; ^{\circ}C$. Approximately how far is the cliff from the observer?

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
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:    
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
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 latx4nc:aol nqn- e:-pe. er. How deep is t:e on n: ealnqc--4x.phe well? (Ignore air 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 sound wave of frequency +cgp8:ip kjk l 7;az/g500 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 air:no)mzjh1*v4jj 9vypl 2( 6 iktmn 8wk 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 with2u- v5mmt4r)7upnt md 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 0m,.z u*gop 2 ceo-ye;qlzwo aidet,fi b3; 80sound?

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 intens4dj vd22 gi4.6ejjp -woqb* (:bm nrqrities of two sounds with intensity levels of 70 dB and 40 d (j 2eqrbo-m*b2 :6p44d w.qvndjigjrB?

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
49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity level by 15 engines i;m: rd.eiuv8 huxnj(1 n a garage is 100 dB. What is the intensity level generated by one h:e(8xn. dv i;1rjuu mengine?

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 k, ohp 0jkd(fu;-.m0:d bkou xfrom a source that is radiating equally in all directions ish ufkdd,o:pjokbx(k-m; .00 u
$6.0 \times 10^{-10} \; W/m^{2}$. 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
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 frohlb0cox ;sv-einrjv r.h6- /7p,ck1 tm a source that is radiating equally in all direcch-eo/ n l,jcvprr s tx1h6-;b7v.ki 0tions 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 assumed to be uniformly uogd i9y i74 qzsm45v355ak eldistributed in s7dz4a5km45giuly3ov eiq 95 all 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 5.00 m from a barking dog. Wt/ m qwsqf*e+rkqo 3+;hat would be the intensity level if two identical dogs very close to each other are barkinqtw3fr *o sq+e+kqm/; g?

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 intensity leve(vihb w*lm44 8ny w1om-w i/npl is 60 dB. What is the intensity leve bw*-m1iiv/p4nwhl8on y(mw4 l (in dB) at a point 2.0 m from the source? 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 whatgf vvcsir725e* +5 uga distance will i 7 5 5fevsvgg*2ruc+iat 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 +i)40fuyt(ui 4k rzbb u.dz+fhas a frequency of 1200 Hz. What is the frequency of the fourth harm+b tu)4(zy f u +ibfuz.rdi40konic?

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 a mky-jotp ;90dupyt h4 dx(kt u:1*or1n open pipe is 900 Hz. What is the length of the pip1or p4;o*0pd1:(jy t ythud9-kumtkxe?

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. What is thvrop0nr r8uwq:*ed amt0sp: bc5e dc3w (y/*-e frequency of the lowest tone that will resonate in*b :*rstu e c3mwpry / (:na8dv-5e0rcoq0 wdp 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 0.8y* / 2)rwzapkvkc m2m 5nu.d1w0 m. If the velocity of sound in air is 340 m/s,u 2n /m k*2yc.1avwmwdr )p5zk 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 wke)kfsw 3y /tsy 55u(px2c1x hhere 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 frequencom6bb)+ x* ijwy in a pipe closed at one end is 330 Hz. What is the frequency of the third hmj) +bb xw6o*iarmonic?

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 o7 ; xj:o;bul;avupr8jf the shortest pipe closed on one end that will have a fundamental frequency of 60 Hz on a day w:u;ru;l p b7x8a jv;johen 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 roo:dzdd;/ .cigjc/h h3qm where 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 tem-znuh9)5zyn or8jxpx4q,1cp perature 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 x,as)ymob q0 -)a0 ibv9ldexw*ba6. elength 0.75 m is played when the speed of sound in air is 340 m/s. What is the fundamental frequ9 0-) eabi6) *ysx0lxed.oaaw,bq v bmency?

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
66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two pipes of thei u3 4foqaco (:d6iz5s same length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fi:3od5 f c6si4 ozuaq(undamental 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 emit a frequence:)t.wn nib+rrwbl/723p)lz( jm s h ksezj44y of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to bebb74) imew 4zkp.l3slhewsjz+: n/j r 2rnt () 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 5; 8:gagrx*h i1uvoip 5twl(;f00 Hz. If the distance from a person to one speaker i w5p ao t;1i;:fr(8gg*vlhuixs 5.00 m 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 Hz and 6 w .n)xyimr9)a ler(j444 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 tuning fork to tune yc vtt) k:85 2 dqmlsv(am5g.tthe frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the .8(vak y:m5 gstq mtct)lv52dinstrument?

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 respective a/fk53 elk*71ltojuf ly. What beat frequency is heard when the horns are sound o/l15k*ka7 j tfuelf3ed 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 striwi ljj 005*tpad*(zo dngs on two violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in th 0l* wdp*azjtjo5(di0e 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 stationaryx,pag9b s22hpmh/b9x 1000-Hz sound source at twice the speed of sound. The observer hearbp 2/sha2b x9p,mxhg 9s 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 frequency of 1000 Hz) approaches a stationary obs2j- it0i.m rpuhk2mk 9erver at one-half the sm-0h.mrk iip2jkt 2u9peed 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 moves with a speed g8us vxfi 3 el vu93q)y0w3c1wof 30 m/s away from the source, what is the frequency heard by the obguixc9) wl vyw0f3s vq38 e3u1server? (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 tz5j *ol/qtzt,bz6+xj6ore* br g v1+lhe speed of sound through air is 340 m/s. The car approaches and passes an ,jj1tol+zr5r xtqz+zbg6ve 6 *o/l*b observer who is standing along the roadside. What change of frequency does the observer hear?

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
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 a train approaches wlgt:xj 18y2rtith a speed of 30 m8glxjy 2t:t1r/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 blows its 400-Hz whis.rp)/v/pq yp ys hn6oqk7fv r4;g5x /ttle. Take the speed of sound to be 340 m/s. Whq.xv/pg) k ;6oq /5 pyhsv4yrp7r/t fnat 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 trai7 k7 bic /(9wso4bqcxnn blows its 400-Hz whistle. Take the speed of sound to be 340 m/skcwqcs /bo4xb7 n (79i. 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 fromws;os*ai phab d/+,-b you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 3hpdbs+a*-bsw ,oi a;/40 m/s. What frequency do you hear?

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
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 whistle, and youmw l7o( ogk,e)v b,l1z hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency)gv,em(, o l z1b7olwk 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 b; bs: /x1 p8aqexncj5thr2g -air is 340 m/s. What is the frequency heard by an observer if the observer ia gs-tp5;/jx hr bc 182bnx:qes 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 i*o2pl e2rl 0hms 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the ob 0ohel lmrp2*2server 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 s1cx/ :rsx28 7kiw0kcv ;p pavsym)z( apeed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast/2 vk: (w1a7p ssxaxmyc p0ik z);rc8v 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 pro i 61k3co9tc*uunxm j-duced 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 1.8nonc,8a-,oo y nbrzu ;6*bpb4. What is the half-angle of the conical shock w8u- r8 ;y nannoopobbb,*,6zcave 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 they28lp c 4i8fieh91e wf United States to Europe with a Mach number of 1.05 where the air temperature1e9ci28f ifpe y4lwh8 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 05:34 , Processed in 1.093065 second(s), 204 queries , Redis On.