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 followi0bl;fie+p3 sz1b z kj;ng 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 conducted fastest nek o4w0 *f rnx rx24vpcl4 ym9)fu ,d1n3:zuqthrough

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 ofs- )wl5b bik:i- br)jp sound in 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 / )vi6n+q 7tzrtj;n1r : z7ra9rljtu cof sound? (Assume that all other factors remain con t v/ 7rtcl)16tr+9j njau7rz;znq: irstant.)

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 velolt ebp1l1j /+dcity of a 200 Hz sound through air i ed/pl1+b jl1ts

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 *kpm ouq,ylbbnig 03 9u7s:; .q6mlufw8 cxe3of a 400 Hz sound, the wavelength of a 200 Hz sound iu eqxymq.cku0nb:g3lof3 ul7,6i 8* bw9pm;sn 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 tob+/jfold - x6qf+g)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 are callt9uj), fmmjl:4ze 6rpp 44 pu9ysa uz.ed

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 direc0ot e6e5zr;syaxcb 2*tions. If you move to a point twice as far away from the source, the frequency of the sound wil y6o*scr;0be a5txze2l be

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
10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  For spherically diveu .m+p6al14ztzqgr. :or8hdus e z;q/rging waves, 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 at4/4jw5fobr-crcd) / xpxfo6y a distance d from the source is I. What is the intensity at a distance 2d from the source jdrr 5)4xw-f6ccox4b/op yf/?

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 d0ye:)*snf o et,6v.h/omb vethat is radiating equally in all directions. What happens to the intensih e*).y,v ovns d6:btefe0/omty 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 (ngrh2(m:ecg/yud j:is radiating equally in all directions. What happens to the intensity level of the s(nymhr (gj g cu:/d2e:ound? 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 followingcpc*wqzhm8c/gsy: 2n, ):lhsl ug -0b increases as a sound becomes louder?

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
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 lj9mx6f xh ,6 0e1lfugof the soum lux0j96f6x f, el1hgnd 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" 6yv+ :pfzrz w/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 "pitch" of a mu,po9x(t-mqoeac:b nq) y,0d m sical 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 2wcakm.; ic 0vc3,+wr jqvff bgx6(2hwater

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 waves ac e9:k usv-3q5e rb9fsv gp34ire

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 guitafmz:xf/nsh3 5 r string and the sound wave generated by the guitar as a resus5/ hn:3xfz mflt 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 both ends, tr;n,cm-sajev8jyd) z 7nh v00here

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 talij0osp44( z; ) h yc/azpx*bep6 -mnhe wavelengths of the three lowest tones producp6a ;zopimh/j* xnb 4 pz)40(y cel-ased 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 20 .9*mab, mihp6wx-:nta4dql d :b1 wif0 Hz. Which one of the following frequencies wab w a b9.tm1l:4h q,i*: pn6dfmx-idwill 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 fundamental frequency xnu1 3(xgvd;stg-6vw. Which statementg 1-3wv xu dt;(6nvgsx 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 at one end and closed at the youn e,060jso4vu kh5p*zj0 tother, 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 wavelengths of the three lt l67y.qs7s pm(k xpe2owest tones producl sxse(m2tq77y p p6k.ed 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 lengwt/e-rgn7u ko;h+w u/ th L is 200 Hz. Which of the followinwe-ruh+w;ugn o t/k7/g frequencies will 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 o d+ 6q z.ffwtq-nxutq*l, kz2/ne end is resonating at its fundamental frequency./w6fq.tz -* fk2t+x,nql duqz Which statement 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 source. Each speaker pdkkck2ek 1: yd6un/:o qh4 m-nroduces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The person iq:k6n2hm:c4ko dkeyd n1k /u -s
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 sound waves should 9luo6-rj dir 1q1-td3oklo3c 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 particular be v b9w74-kll hipt8dn7w5fli1 at frequency is heard. What happens to the beat frequency if the frequency of one of the tones is increase1 875dptwki9l 7 -lvi hlnw4bfd?

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 explai tzrzbr ; -w4fd1q*jw0ns

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 frol*p m9y h9;)jm73;k3mpqohzcr a(z lequency heard by the observer mk;p;lzm *j3a(o hqrl39 mzh cp)yo97is

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 statij.col8a 1c tlq+tt6o3lr1q9 gonary observer. The frequency heard by the observe63ql qt9t ot+cjl1o r18.gcalr is

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
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 2- i9g p idoqy1.-drxlMACH-speed, its half-angle will decrease by a factoiidol-x-g1 2ydp .r9 qr 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. What is ag)x7s4(bs(smm x qu- the aisau4s-mb7s()(xg qx mr 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 sound in a dxn-gmmv/x n/ 3ykk e1db;39mir 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 oind6gwx/83 ) nnfah-uf sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0nhi/ aux f8-6)nd gw3n.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 the.;nyl )pzcu;i 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 se. w;mut4uj3 qg19a*f whns p4ieing a flash of lightning, the distance to the lightning strik a .f9;njgu itup*wq4 hs1mw43e is about

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
41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An echo is heard 2.0 s fro i+:4 nt( hhof3r:fi+d q)fzu+kly s9gm 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 2.5dn6z+2y-j g is s later. How deep is the well? (Ignore air resistance, and assume tn-ji6gzs+2 d yhe 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 sound0 fui z3.sh0oc 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 a,aa ;rev86t c8us cmu3 gf*l)eir 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 intensitya psumr r9b ggc6b9ju/ 65)y6y $10^{-3} \; W/m^{2}$?

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-dBvc,x*m67 yy.(up2oo2vlpd lb sound?

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 intensity levels of 70 st- 0glg v;r4r ,sue)6mzsy1uitpk,1 dB1grvpu1 0sys,g i 6;mzutstrk, -e4) l and 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 x15t eiqq7fq8/2l fhf dB. What is the intensity level generated by one enginf5q2h/q f 8t lfix71eqe?

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 thav.lb m(nab8: jt is radiating equally in all directio bnlbv j8(a.:mns 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 radiating equally bu4aiq,.l o/y in all directi4 au.bq /oy,lions 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 h,v2vv tmgd4ds/+w zfg(6c t/uniformly distributed in all directions. What is the intensity level at a distance 5d2v4vg6s g,hm/+ cv/tt(fz dw.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 d ptr6eh* d+h9bed ,+ yrsf*:tfB at a distance 5.00 m from a barking dog. What would be thf6+:r*te+ep h,b *yts rhd9 fde 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 intelce c jh6w1ca0 m3w,g)nsity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from th ,m6c1j)3ch0l ac wewge 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 cv:fniey.(e7cwwttdc++d 4l-r*1.o/ c bw gzfrom a point source is 95 dB. At what distance will it .tc-bd+ ew*wv.gzi 7elc nrcd4:+w(1 yf cot/ 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 50 tjf -6rtsjwa frequency of 1200 Hz. What is the frequency of the fourth htw5 - jj0fr6tsarmonic?

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
57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of the third harmonictcw5 y flr+ -nsrw8xr5:u;0rtzf+ w +h of an open pipe is 900 Hz. What is the length of the pi5: +; lrhs+8rfnz+f0ycrxt5w-t wu rwpe?

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 l ixd5yz8s nvja7r :(2in an open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in dns a(l85:rzvjy x27ian 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 koxon 3-p)4j v0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the second harmo v-x43 onjokp)nic?

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 d2,km)(e hg1np zhab 8*jdxtox8 ma*1e 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
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 is0 gip-y1b hn +fgcm8p1 the frequency of theigg +p 81f-c bnm1hpy0 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 ofz v0usv 5v,j4r nn+d:c the shortest pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound is 4n0vcd rv sj:,uv+5zn 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 tempersfr*c x3 rnx3) qbx3i.p9hb4qature 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 te5jzamzbc8-.2 m h n(wdmperature 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 soundlnhg2)ugekb- l1wcl )r+g;hwmz): 5k in air is 340 mkz u21e)gnlc:lw5)hm) gghw-l+bk ;r/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 lengav/*12/he l0czzh7a/xj aege th: 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 fundamental frequency of the closed pie/z 1 laxec2eaah/ *h0jg7/zvpe?

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
67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two adjacent sources each emit3ajdyyx*k. qel6 )fk3idq1 0 5ovwsy8 a frequency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in front of j*5yl)q3yd16. aw ko8es fxqv0d3y kithe 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 drive-nfydl+c; :cd(sx9 hvn 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 possible the distance from the person to the other speaker? (The sound speed is 340 m/s.)s -dn;(l:y9c h +xvfdc

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 2 c6va:7pw8nc1evq6miyyl7 v9 s raj: of 440 Hz 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 tuninll tq2h(tj)1fny k2u1g fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of l f 1qk()2 tu1lhytn2j2 Hz, what is the frequency of the instrument?

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
71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The wavelengths of the sounds produced by twoo s3 c 5m+:ff+1exjkpx horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when1fj :3xp x+5e fokm+sc 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 orchestua*ssq;n7)e7.h4/suswwd w6/ vq kuwra 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 them to theww ssq/ud u*wn6av e4s hws)7/7u .kq; 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 )k: fjon-j/+hnqea .f vzd53ysound source at twice the speed of sound. The observer hears a f/qh:3fyzve j 5oj a)-d+f nn.krequency 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 (normauni q65 6/txmdl frequency of 1000 Hz) approaches a stationary observer at one-half the spee6 d/mu65x tiqnd 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 d:2q eq,eg)ngmoves with a speed of 30 m/s away from the source, whatgq, :eqn2e)gd is the frequency heard by the observer? (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 on37yy .k61fnhe m-qxwhen the speed of sound through air is 340 m/s. The car approaches and passy en3kxmf6q1 .o yhn-7es an 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
77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the frequency heard 4)zwaxn j z1i -eaczw9*mcj99by a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz4)ce9 9wia1cwj9 z-z* xjnma z 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 towarhx0wq: 1p8ee; tn; xnod you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound 8 :etw;;nep 1oq0 nhxxto be 340 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 towq yx ab7aw/3ym:*,qrg :sg:ee5 kf2h zard a stationary train. The train blows its 400-Hz whistle. Take the speed of sound toy*w egyb5 ge3rka,2 aqf:s:z:7h mqx/ 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 frosf8rus ph)x6.m you at 120 km/h. The train blows its 400-Hz whistle. Takeh f)6sx.pr8 us the speed 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 at 120 km/h. p9 k7-snl1e , dd2xun1x 9uhjcak8:c bIt blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the ac9u s9: nln k7dxbpcua -d,jex1 1ch82ktual 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 horn is 500 Ht)v ys y( ow-8 1jpglaovd:/)bz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by:gsd1 )v( to/ wv8oybj )l-pay 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. Assume the speed of sound in airka 2mh2ciz.5h is 340 m/s. Wi 2. z2mc5hkhahat 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. un3tuv)sr. ;b A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the spe 3r uuv;st.nb)ed 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 thikog17ld:6cd vy9* n oe conical 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
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-angc4 ii5b4g,:h-d sl gjtle of the conical shock wav g, g4sti4dlb5hc-ji:e 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 6 7jk-5;0n nem +g bwire)4lfs a*kagcwith a Mach number of 1.05 whe sji*gm nk7 )a0+5agkwrcf -6e;n b4elre 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
  • :
    •
    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, 2025-4-12 08:51 , Processed in 0.493219 second(s), 196 queries , Redis On.