题库网 (tiku.one)

 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
本习题练习来源于题库网 (https://tiku.one)，是在线习题练习的打印版，您也可以访问本平台网站(https://tiku.one/)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://tiku.one/test70.html
 作者: admin  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 l/xx12uu-g basau 0,f04zzet is a 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 coz :: t*b6ypst 44*zm cwagzvh-yao9y7 nducted 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 steel rodby;kcr 3c9xo9jbw (4c9u/kvn?

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, bb*twr /; wbgx2r qz59 ggc623 vh3unewhat happens to the velocity of sound? (Assume that all other factorsb6;hq2g cw9x5erv/bu2tgz 3 *g brw 3n 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 of a 200 Hz sound 46p6*zyn 9 psu+qgxaxp/sdn7 throug/* +dy7xx p4n6 s9pzu6nq agpsh 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 wavelength of a 400 Hz sound, the wavelength o2v5sx6wn7 rj4szla7 of a 200 Hz sound in air iw7n2 svxr76 la5j4 oszs

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 freqxi+8:glvv x /0cj8 tgiuencies greater than 20,000 Hz are called

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，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
8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequency less than 20 Hz arz.4ptho) b4gee 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 w6-q+rchkp 2k uniformly in all directions. If you mokk+-6pqhc2 rw ve to a point 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, intensi x/f(i9genb.pj)6vfrq /s /oxty 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 ths , z4okd9vqrfmht/1cj+ -by) e source is I. What is the intensity at a dist+vft qk49yo)1b/,cj dh smz-r ance 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 so1rsfh8f v(lkr.gk7 l9urce that is radiating equally in all directions. What happens to kfgk(9flrl r h.vs781the 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 h7yy w2 he53n8jp(/8g ocsir-lu 4j hnin all directions. What happens to the intensity level /ehl24- 5 hjc3 yy8wpr87iujonhgns( 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 increases as a sound m*; .jy i02mvfwqq*hh 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. Wh 4qz; 6ov*qshulnl70 lat characteristic of the*s7ll n o6zv40lhqu;q sound 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 musicaw+fu 8k:t6 tppnm/k2ll 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 musical note?;r 0 2wuzapus0*0l.h( ainrhg

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 fro3 d 0n)iioec;nm air into water

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 wa)wjpk i,d..iv 2sa t.jves 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 o.4 efa6o* o0azt az0n4xk*un 0q7awczn a guitar string and the sound wave generated by the gui a0nk*4tz. 04*zoeaqwn 7zfu0a aoxc 6tar as a result 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 pipe6( ha 0i r5w3oevt-dsy which is open at both ends, there

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，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 wavelengthsqqijx /1 c,5xlg ,h;wm of the three lowest tone,,c1m;glhwixq5jq/ x s 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 oywvm l-kp06 z1pen pipe of length L is 200 Hz. Which one of the following frequencies wv-zm6 k 1wlp0yill not resonate in the same pipe?

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，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
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 fundamentacst2nn +ti 6m5)v:x ubl frequency. Which stateism n2u+x cvt:5tb6n)ment 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 is open atri8m em3k9ufoq4en8gxbe*. . one end and closed at the other, there

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，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/4-r m2 gwlbh)gif-ik p0shp - wavelengths of the three lowest tones produced )s ggwhpr flb-imk /2p-i0h-4by this pipe?

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，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
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 -ds n0rb7cr)7dcll -fet. m- pthe following frequencies will not resonate in that piped---n7mlbdl r)0 7sec pftcr. ?

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 isqn7ismup **6 z resonating at its fundamental frequency. Which 67qi *mz*nup sstatement is correct?

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，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 two speakers driven by the same sou ccf(p/-fw 1v0up*z 6c hi4mforce. Each speaker produces a tone with a frequency of 200 Hz ofp f/4* (czfhp1c6uw- v0micon 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, thl ;yz5o-cym*o e 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 partmglki)awrtro 939:0 w4mf*h bicular beat frequency is heard. What happens to the beat frequfw 93 moa:)m btwgrli*h40kr9ency if the frequency of one of the tones is increased?

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，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 explainjeku:fn ts1 i2xw(j-7 s

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. Theobp u2ot19k y 5jqxq1+ frequency heard by the obsero1o1b2yk+j5 u t q9qxpver 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 hearj uuc.21skihu2 bmh p(xnh7/1d by the observer i2h2.xj/bh nsuu7(miph ku1c 1s

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 3 yp92+ -bdek3l lhpsho9vgb1 will decrease by a factor ofl+bok3 lh 93peg- hybdp219 vs:

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. wy/qzh-64v 4u7nepvp odb afx2u7b;1What is the air tempy/2;phoav nwfdqb6ebz4 x1-vu 77pu4 erature?

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 t )0ext ol wo7ogsj/g)so5o.t3he speed 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 io mfc(ue f0o6jm390hsc/gp; ls 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away wsfchlg ojm;p90( /mce0u 3f6oas 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 cliffeq ;p-vs 8i+gpfugdrz8a,33 e, and hear 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 r6p6l)4dpb0yj6bf(q ; x vykxflash of lightning, the distance to the light b y(vkdp6xf) 6j;60lqp4r ybxning 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 2.0o9 k3k i9wcuva7xb fg)o 7p(c6 s from 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 tr9aw dbpfnfa ln6u w0uzg6*1jep1 +ne2b7) l9he splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sound is + wf1nae9j6ugw* blu20 df b7n1pnl9rz ea6p)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 airz 9169 jhhy okxad(x6o of a sound 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 air at hc0 5217n dinzdk ie/2mk-ba z$23 \; ^{\circ}C$ 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 1bd0dfbc 9u1o/ p6.s-b zy)ah 5sukcta 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-dB nf2eqyo ce qol s:g,6*.ge-g6sound?

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 with intodo llyf ))9hvyh3 mc0fn56;bensity levels of 70 dB and 40 dh ;0h3y 65n)cfbllofod v9y )mB?

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 dBvis .k(anc c8:47ndku. What is the intensity level generated by one enginesdcni4 kkc n7a.u8(v:?

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 tgy p3)c+ mrz)ihat is radiating equally in all dire)pc m )g3rz+yictions 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 from a source that is radiatin 8zfa 0b.8sx-fe l1xqgg equally in all directions1x0 fxalgqb8z8 -ef. s 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 isjry0kbv8*57cybw5 g ri lt;mp8 sn-j. assumed to be uniformly distributed in all directions. ywsk-*jrl 0 8p.bc7;rm y5tv5 g8ijn bWhat 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 u2kz ryj76*xai z f*;xdog. What would be the intensity level if two iz;j6kafzuy i2xrx**7 dentical 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 intensity level is 60 dB. W+or6dqgdx)k0,n8-c .txod y dhat is the intensity level (in dB) at a point 2.0 m from the source? Assume that the sourcn,6xdt) k. +x0-d8cd gqodyor e 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 sourz,huf f g 1g)n+/e)wxsce is 95 dB. At what distance will it be 75) wufz/hfgsx+1e, gn) dB?

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，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
56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The third harmonic of a complex tone ha+6ob9 ;jsbb kos a frequency of 1200 Hz. What is the frequency of the fbk;bos6j9+ob ourth 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.yauug69 vn2i +(a as +xbfif- 900 Hz. What is the length of saf vfa 9-ibn(y .6aug+2+ixu the pipe?

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，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
58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The lowest tone to resonate in an opeln-a: v *vc.vnk waxzw+.i.4dn pipe of length L is 400 Hz. What is the frequency of thnd..w-v claizn: ak.vx4 +vw*e 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 lenv 15qrp;7t *1u yr.xm-ivl qjfgth of 0.80 m. If the velocity of sound in air is 34 1r;rm-tvj1x7y. u 5q*fip lqv0 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 the temperaturaa71t-wp - g2odfozdct,6 x: se 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 clz. s0reql)rkin/wf6 exd/yi 69vi,x /p0 qn,sosed at one end is 330 Hz. What is the frequ// sxz ,rpli6dnie0i v w9/kre,fnq6).yx 0q sency 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 th4 zm6od fy2sy,kmtl.3 e shortest pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of souny 6mo, m34.kyslfzd2td 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 isz.6v z a*n o7* r/-2hh7msdb/zxmf kffeq 2fw, in a room 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 whelbzp+ aq03 o9xre 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 ofps luw6i bkfw q (x9;gqb)9r2/ length 0.75 m is played when the speed of sound in air is w (w/9s6kf q2b; l)gqui rb9xp340 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 usz 2gj(6:ridiv-v1n 0t,nw uv-w x r7is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamj71svw--ivwr rzi2: t(nuxd n 0g ,6uvental 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 4 wc7xcmep8. vfrequency of 800 Hz in air where the velocity of sound is 340 m/s. How much wempc78v 4c.x farther back would source 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 placuz 7+vtiwuh), ed side by 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 possibhu vu7,t)z+iwle 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. Wha7 zr;7ks.lsdns(q mn +t 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 the frequency of w :0f)x; +vhavy,hp yrc /f r*(dwnwh/8g1uyh a musical instrument. If the tuner hears a beat frequency wg*y,0 fp/chhvu;yv/d8 +xwy(: hr1rf)n wha 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 produced by two horns are 6 m and 7 dgo/y*.;w:; cem nwxz,z. c sqm respectively. What beat frequency is heard when the horns are sounded on a day when the velocity of sound is ,/zcy eds. *qzc;nx;w om.: gw340 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 orcudnv;g; b2yow( ov8777tm trshestra are found to produce a beat 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 them7dvg8 wtt;noo7;ys 2r(ubvm 7 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 source at e1hhr(ncrnuw6efkx- 4 .6 . f;x8 pivltwice the speed of sound. The observer hears a frequency xinhr vxrnhuee f14.8 kw p(.;-66cflof

参考答案:    
本习题练习全部题目来源于题库网 (https://tiku.one)，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 16rl*m3w +xtz a/affy6000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears a frefyl mx/w+6z3f*6 aat rquency 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 of 30 6-t kv0 ;b5*sgcmj(kv lgyb*uz32po um/s away from the source, what is the frequency heard by the observer? (The sound speed isskv z0y5-mv 2oul(bjc*p 3k6g ub *;gt 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 800-2b-l0 ro1xsxpgw(+hy3c( n0nw v g o+vHz siren. It is traveling at 35 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 of frequency doesb-1vn 3x0co+l+(rov xnsw g0(2whyp g 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 a train approache)kz5 sp*;kx-ywyt bq1s with a speed of 30 m/tpk-by ; 1)5 zwys*kxqs. 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. T upnkc .v,ij66 qwrf(/t1roz 7he train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequenn,6jct or1wkr7i/p .q6fvu(zcy 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 t:;gly6y5 a (2xt6jsqs(xg-r qtov/ sdrain blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do yougtx: x2vgj/6-qastd ; qysslr 65(yo( 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 km946jl aw+vytr k)kow. /h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hev+ w atr4o6wk.j9kly )ar?

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 aw1ijjso7.l g(:2am.t*a55winv-pqbd cc- iwhistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the acswiojja5lv.ba2ic(gw d:a-.*71ptmn5 i-cq tual 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 ho: t8wr-7tau9o eo0y io9p ck+qrn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency r qpt0ew- i +yoao8uk:9oc97 theard by an observer 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 horn is 500 Hz. )sgmayv5 r-4x Assume the speed of sound in air is 340 m/s. What is the freqxgv4ym) a5r-suency 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 s6uz nrh1;ypymmg0rf:79 /vp yignal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the object movin0 / 1muhm:rvg7p;y r zfn9py6yg?

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 thuglrmz7*2xgle 8: /iv e conical shock 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 of Mach 1.4.pb9yj ;,okoj4(u6n h/awa:zb What is the half-angle of the conical shock wb:4y 6anw bjpko za/9ho;u j,(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 z0z+f:-mq esv6 nlw)o Mach number of 1.05 wher:w-+es0z6mnl ) v ofqze the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

参考答案:    
  • 答题人:
    •
    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
    本系统支持习题练习，作业与考试三大模式，作业考试自动评分，成绩排序一键导出，可设定动态变量同一试卷千人千题
    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!   © 2024 题库网 (https://tiku.one)版权所有

    浏览记录|使用帮助|手机版|切到手机版|题库网 (https://tiku.one)

    GMT+8, 2024-10-3 11:25 , Processed in 0.433409 second(s), 195 queries , Redis On.