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://autodiscover.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://autodiscover.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 false s4,,fjb7lx ul 7vho9yqak j 1.etatement?

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 co pm7r0rlyti4 l25 p+manducted 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 sounn(e / 3 w+wl.zux,xx+gdksbw+d 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 of2i6s umx 6241 e9otubcbv: qtl sound? (Assume that al4u2:uq6mb ot lvxb62s e9 i1ctl other factors remain constant.)

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xxxxxxxxxx，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
5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the velocity of a pr eqj fd+81x.r5n 7pz400 Hz sound, the velocity of a 200 Hz sound through.z8xjf+ p15pedr r7nq 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, - pm:5svp .0brw4f lms7xc-do the wavelength of a 200 Hz sound in 5r-fx pps0o.ls:mcvmb47 -w dair 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 calleo( rn*6ot pbjofo()-qd

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 than 20 Hz are calleki 5p/lhdx- /cqyb:0bd

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 ad q*gapzk,9p3 e::vrk :m/tgcll directions. If you move to a point twice a:ge ap9 g3mc rz:qv,td*k:p/ ks 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, intensity is ++v c58q+ yits0wevfi 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 sourceq1/3k+ttg e3 /kboegq is I. What is the intensity at a distance 2 3t etg+qo3keg// qk1bd 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 source that is radiating equally in (.xms m36ynoe all directions. What happeo.m smn6( ye3xns 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 vs:( vjpr/r-gh(xc: )7ep5hw +chspn is radiating equally in all di:r5xcvr :pe (nhjgsp)7vsh-+(/wh cp rections. What happens to the intensity level 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 in hql+a1py)tee1ge 8gi n7b91ncreases 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 a speaker emitting a pure tone. What characteristic o c85 l- w0gog;7nraeejf the se5jolwge -0ar8 g;c7 nound increases?

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xxxxxxxxxx，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 "loudnessn-c2s e/xoerr f//xqzx:* f0s " 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 musical note?d/x1s-tej:qb ;hd)5 icro h0u

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 int q *.d )1:wb g8xikfnor)8rrero 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 2lc5 iwf;jo; u.+raxg waves 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 sr 4brj.pxrzm9 0 k6p:ttring and the sound wave generated by th. 0ppbm6:rrjrz tx49ke guitar 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 pipe which 9 0gzu9oz*zx7lul:5a x2zpguis open 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 L. dje 3gg-4eb, f b2,uiuWhat are the wavelengths of the three lowest tones prodj,b difbg -e4eu2 3u,guced 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 21kufk4hnsq./p: 7wla+ln xb200 Hz. Which one of the following frequencies willa nk4q xf1 u7pl2:l bhw/ns.+k not resonate 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 7fvq r 7.s-b/qbf.c adL is resonating at its fundamental frequency. Which statement is co7cv .- bfds7qf /bqa.rrrect?

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 onc+lsov*l q 96je 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 ar xy0*hxpqt-i: e the wavelengths of the three lowest tones produced -x pi: *ytqh0xby 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 200jyn puvc075 jl10ei8 3ux+vlc Hz. Which of the following frequencies will not ri0jjvnve31ypcl 5xl80cu +u7 esonate 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 agd 6v+haz- s4/b ase2at one end is resonating at its fundamental frequency. Whi h4bvdaz/62gas-s+ ae ch 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 tw8fk l s4wt( z8 p9mb.lhjqm:iv4d/9hgo speakers driven by the same source. Each speaker produces a tone wikm s 4p( 4wgdfbh 9jlv :8/mhi9tq.8zlth 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 sound waves su.hud t+3h/hbztv u .6hould 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 s5 i)7bc8).svcgho h qe vn)l;aounded together and a particular beat frequency is heard. What happens to tvvhibc )l nqos a;87.)c)ehg5he beat frequency if the frequency of one of the tones is increased?

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xxxxxxxxxx，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
32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift exp-7t)ap7 hnlzbdssb7on, u :-p11aznx lains

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 ;pnijgq i; *h/4hyp* kobserver. The frequency heard by the observer ijhi4 *qp;kpn; /*y higs

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 fr,kki u bk)qykm127ck az +-kb64r4lpm om a stationary observer. The frequency heard by the observer ic7y rb4bm- l2+ku q4 ikp,61kmzka)k ks

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-anglejifx +; ,j3tye will decrease by a factori,jy;et + jx3f 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 m hfphf).0k(.eahvy. frequency 45 kHz in air is 352 m/s. What is th.hf()ahev fkmh0p. y .e air 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 oqx0*.m d 1+ykszxe)dl sdw4/qf 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 is 340 m/s, a bat emits a shriek/bkw mkgf/lom*p4lr)3 1sd* f whose echo reaches it 0.0250ksml ffk4w mor*1*3 lp g/b)d/ 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 echo iuh7w+i*pa(7hg v cs 2vn 4.00 s. The temperature is $0 \; ^{\circ}C$. How far away is the cliff?

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xxxxxxxxxx，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
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 dis2da9sk6xzzq ,ua;c g 4,d oi0etance to the lightnino ugscde dx2q4z 0zk,;,ai 69ag 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 da /)- ygsftuzu9 +hskssqbf;9+ y 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 dee3d+d* udpt6pwao( r /bp well and hear the splash 2.5 s later. How deep is the well? (Ignore*pd 6wd(bou 3ad ptr+/ 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 so081v5 amr lyiiw :f3mbund wave of frequency 500 Hz 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xxxxxxxxxx，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
45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound traveling in air an3f*4j 45 q fej5vobgst $23 \; ^{\circ}C$ 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 intensit8e 9*a+ )mkpns yad:oyy $10^{-3} \; W/m^{2}$?

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 /28aks : biw6jn*rpcea 70-dB 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 tcol a wi3cc7)-0nc9+yj;.pp9lgyu j whe intensities of two sounds with intensity levels of 70 dB and 40 dBngl cpy)7.o w9 y ;wpl jc0a+-9jucic3?

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. *vcr vey 6f5 lc6x.6gogr9; cg What is the intensity level generatevo rg cg69lxcyvr ;fe6c65* g.d by one 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 u/ua:fg ipq rlz bwr.b5;tta 8b)a:)0m from a source that is radiating equally in all dirtraubt )z;g /r8:uaf0:b a wbi.pq)5 lections 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 sou ijz+q0 cqq, 9kxxmoms7kf30 9rce that is radiating equally in all directions i0fiokqx7c3 xq9km ,0zm+9sjqs
$6.0 \times 10^{-10} \; W/m^{2}$. What is the intensity level in 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xxxxxxxxxx，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
52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A barking dog delivers abouo5akw(qkp j q;m9e; 6ht 1 mW of power, which is assumed to be uniformly distributed in all o(aw;59kmhqj pk6eq; directions. What is the intensity level at a distance 5.00 m from the dog?

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xxxxxxxxxx，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
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,,ya t wwsb)b2 barking dog. What would be the intensity level if two identical dogs very close to eachab, bt2)wyws , 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 inte6oy6eyba-xg g t6s x(xk j)a3+nsity level is 60 dB. What is the inte jg 3+atgyxoa)(6xy6 6bk x-sensity level (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 le 2el8pftf:yuhb ehc o .e4:;3kvel 5.0 m from a point source is 95 dB. At what distance will ilh;3y2p:eobek h ftec 84.u :ft 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 tonexlz9 cdw4w+v; has a frequency of 1200 Hz. What is the frequency of the fourth harmo4ww + xvzdlc;9nic?

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 10lvq :-f 5o)vlzl wdvan open pipe is 900 Hz. What is the length of the fv )-olzllvwdq1:5 v0 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;3n.rtss 4vgz an open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will .;r 4nsg tsvz3resonate 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 at389k n up co0wtd3sm1c both ends has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the second harm 0utm oc83sdcnk19w p3onic?

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 temperatun)cjayj+ ( lw(re 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 closed at one end is 330 Hz. What is the f0a: e-tyyl mmc-g -t1orequency of thlmt--o0e ymy-:tacg 1 e 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 w1t/tg;u29t 0s xq :(mckwivq the shortest pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of soun / w1imgvqx:u;c02kw(9st tqtd 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 ronb+, e)vtvtubyr/d*.kh0nfy :r9lm * om 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 isezhk:u1i q4m9zxp 8(i in a room where 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 of length 0.75 m is played t)2l dcpq 8u9cwhen the speed of sound in air is 340 m/s. Wh ud qlctc92p8)at 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 is cl wt-4u o4b/o:emdf m0cosed on one end. If the fundamental frequency of the open pipe uc4do0 w/4b e mf:mot-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 air where rzlne+1(/z mtthe velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in ml/t z(e1rnz+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 sidef2 m3nbt zn37u p55hoe 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 possible the distance from the pers mt3nz3f o5enph25 7ubon to the other speaker? (The sound speed 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xxxxxxxxxx，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
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 th16f6 4klrfuwzod6 vh6e 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 a musical in9( dbs9bz2 vfzc9o6q-q5 lyu estrumzu9z-qf vdb cq59sy lo2b(69eent. If the tuner hears a 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 prod t:vd a eoram we75m2xtm750wzf2sg 1-uced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on am xe0a27vfga2 t -5e:mrswwt m57doz1 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xxxxxxxxxx，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 an orchestrdlql:nkf9o8 l6u3*te a are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tensi6l*o 8tl9: ndeflu qk3on 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 source at twice the speed of sz3p v:k2zb qc/(nwz( voundcwvzvk3qbnzp2(( /z:. The observer hears a frequency of

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xxxxxxxxxx，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
74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source (normal fim7p9a3:okab f c,b)frequency of 1000 Hz) approaches a stationary observer at ofobip7 9 ) 3akm:,bfacne-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 frequeihn 8b,:uz c;.nu4ol8mt 3d hvncy of 1000 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The : .z8;, com b83h4uilntvhdn usound 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 tf : ;eku*in4 j)-a-cy a *hsok+wsjb(jhe 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 does the observe y j)so(k*j 4sh b*uinacw:f-ake; -j+r 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 stationa ;4zy5a hlzpj ajwn.+7arn2x4j; j7ujry observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed ojjz2 z 5ar4 7w;4 j;ln+h.x7ypa anujjf 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 whisivhdxw9: h d;;tle. Take the speed of sound to be 340 m/s. What frx; 9v;whi dd:hequency do you hear?

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xxxxxxxxxx，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
79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are moving at 120 km/x8p4zmi zgegfv-4 /d8h toward a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m gg ifzzm 48v4d-/xp8e/s. What frequency do you hear?

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xxxxxxxxxx，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
80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling away from you atj 7hnu7/+iq jd 120 km/h. The train blows its 400-Hz whistlej j+dq7/ iunh7. Take 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. It:*bjqlg+ho * w blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency ofb+q:johg w** l 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. Assumwsq2x7/c65 )hikgpr me the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer mhg7 /kws65pc)rix2 q 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 ahs 64sc)mca5doua cgh5 -o55dir is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speed of65a)5c ohhdmc-ocgs d554asu 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 signal is sent out, 2heqd,d*d -ul and a 42-kHz signal is returned. Assume the speed of sound is 345 h- le,qdud2*d 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 przw 7v1)n.qced8 o1w.rqqipq 0 oduced 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. What i 4eu9wyexu*a f-0y +ans the half-angle of the conical shock fy4 y+09ae-uuwane*xwave 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 Unitkzkwxt4l 6n b/ +ry-3 4f,md)f yb)qzwed States to Europe with a Mach number of 1.05 where the air temperature kw4)y/mlzxzrb)qw+6 4ndf-3bk tyf, 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

    试卷内容到此结束!   © 2025 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, 2025-12-20 01:57 , Processed in 2.331971 second(s), 204 queries , Redis On.