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 is4 7.c,odat8 pwy*q bmt 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 ;9p0:vsirk reconducted 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 .8sq 8tcu7upxvh am+wfv+04q 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 airtv m;nysu b k:us;;(my-9qeh . increases, what happens to the velocity of sound? (Assume that all other factors remain mys9h;et;;n.bks( v:um y- qu 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 2ni; zpc(u - 8qe6azph,00 Hz sound through air 8;zi a-,heup6cq (zp nis

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 w.nmjf: (c:r rbaw-k8Hz sound, the wavelength of a 200 Hz sound in air i8f:(m ww nkc bjr.ra-:s

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
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 nscxfj0ga)n 0w 1)w()nj/ lly 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 frequency less thang. 8ovo9a5snz (um.m bs 0gfg3 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 emitqi gqc6i ,qf7:ting waves uniformly in all directions. If you move to a point twice as far away from the source,c g qii:7qqf6, 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 wavexl1h:k*hyql. s, intensity is proportional to

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
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 sour0j5a dc3bxl m*ce is I. What is the ibadx5c j* lm30ntensity at a distance 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 source that is radiating equally in all- w+ntcbhy k.75a)uson/ 7 bxu directions. What happens to the intensity oboa+k uun5/bh.yxw 7c7n-) tsf 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 sob o0)yq*qkh k7urce that is radiating equally in all directions. What happens to the h * bqq7y)0okkintensity level of the sound? It drops by

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
14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the followia5zwf)otm tfzy(*6qbknc(3 4 ng increases 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 characteristichl)6bqwhyz85 :kw0p w of the sound increasepqww 0 h:8k 6w5yzb)hls?

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 aw2d6uxmx-oao dzf+ z /0m vi.a5w;b2 z 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 mubd;hs7b1 wfj h8 q)lk1sical 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 3ubtsl*/wmi 7water

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 ( a(v+pqcr41/r( bfg,gmhgks 6i2pta 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 string and the sound wave generated q gdt0::uu:2twn/n bee 6k9hx6tj 3n lby the gutwehk/dt6j: u3u62q xben:n n 9g0lt:itar 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 is opencut:*gs( dqzzb m(xyk)kb45( 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. What are the wavelengths of the three d xa mt26qu:vpxnl: p3e, hv1 lz7kz/kp,3ii8lowest tones produced by thislmtvkv1 qnix8, e:62,/7zhxp zk 3lip pa: 3ud 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 anua 08ezmx 3g3l open pipe of length L is 200 Hz. Which one of the following frez0umxl3 a8 ge3quencies will 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 s:t 49 z4ep6zy/dyn ocL is resonating at its fundamental frequency. Which stattcz44nye y po :/9zsd6ement 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 at9iab0x r)5a 7nuvrje, 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. Wh er6/yl:zag t+fll 4ag8i9fs5at are the wavelengths of the three lowest tones produced by this pipe?f ae6g:zllytga +8rf/i 4ls59

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 pipp1zg 4kq b5qy* y6,m8yetvke,e of length L is 200 Hz. Which of the foy , 1yt*zqpgvmk86ye54bq, k ellowing frequencies will not resonate in that 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
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 ig+ds,2zb/ n3p -txm ohs resonating at its fundamental frequency. Which state2-3hgxtmb ozsp/ ,n d+ment 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 same source. Each speuctc,di7p( +laker produces a t,cicp+(tul 7d one 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 sy:wwy bgov o.m au4u.i2sy)j/ kv.85sound 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 particular beat frdpocygr;z5o 5w8 +6 hti*lufhwb 5m,+equency is heard. What happens to the beat frequency if the frequency of one of the tones is inc w+mg6pybc lrhfzt* ;iu5+5o,wo 8d5 hreased?

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 explains15(u4rh cpvno9 h5uus f;r n5c

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
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 frequency heard by b8f 5 9j:hwyt3te.npkthe observer i 5tphfy3e n8b:t9jkw.s

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 heard by ti 78t-)isl1hvy bz+oz/c ng+ jhe obsnz-ii zgo+ sc8lhbjvy71t)/ + erver is

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-sbuagl: odctwmc, ,s6x)4 pq+0peed, its half-angle will decrease by a +m6)xbw ,l qa tc,o:s04p gcudfactor 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 ultrason l*lzb5g 0ntpvfx-o*7 5j kcy)ic sound of frequency 45 kHz in air is 352 m/s. What is the air tempera y 5j0oz*pvl75gftxc lk b-)*nture?

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 air at ccvpxh,0o rto)t24m 1$0 \; ^{\circ}C$ 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 l io)5dqyi6)q) s wldh.kf/w5of sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. Hl/qokd s6.) dhq 55iwy wilf))ow 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 in 4.00 s. The temperature is:p+oxdi. w3r( l6 hcvb $0 \; ^{\circ}C$. 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 seeinf-)l,e, g* ho2 wyupth6xj 7exg a flash of lightning, the distance to the lightning strike is abot, 6f yg,e7ujol*x-h phw)x e2ut

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 from a cliff oupb6 g8kt l4s5n 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:    
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
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 later. How deep iszgn; :ygwt1n 6syu+*x the well? (Ignore air resistance, and a 6n t1yygunx*s:zgw;+ ssume 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 souhi ssz)0agq8+nd 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 8i2yfgaaqy;0 7 zpfz ;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 intensitybqj * j1km5h;eh85ykz $10^{-3} \; W/m^{2}$?

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 s6/tyf69na 9 n6t(9d:b objtlkxuud5 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 off3j 9+ dfds+dk;um,de two sounds with intensity levels of 70 dB and 40 dB? f+f+sdm9dkdu; 3edj ,

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 0/l s0np:suu oengines in a garage is 100 dB. What is the intensity level generated by usu:n /0sl po0one 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 radiati:67bfp q, quqwng equally in all directions is7 p:f quwqq,b6
$6.0 \times 10^{-10} \; W/m^{2}$. 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 indnzo(ga fh+3 tc3c-* e 3 neh-*ozccfga(3d+tall 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 ab o ),s o:i00bdzvflsz34n)q valz *if+out 1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00+ 3vao sq z0 svil4z,i)0o*)bfznf:dl 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 ;*gc9u 8o lgvxfrom a barking dog. What would be the intensitxo*98;gu vclgy 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 intensity level is 60 dB:cvhd 8 d2qr,bnk/)gi n+/kio. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equally in all dikb,kn/+:dd82 /qi)h nc r vigorections.

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 sourc tei *i;4jpml0e is 95 dB. At what distance *;04lmp iitje will it 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 ou/hhqa. - ,vvce;upy0 f 1200 Hz. What is the frequency of th;eh/u y-.q,p uavv 0che fourth 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 v(afas2, ev; y900 Hz. What is the length of th(evvf2a,s;ay e 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 an open pipe of length L is 400 Hz. What is mfyht0z ktm c: 81v7l.the frequency of the lowest tone th10 y kt8m fvzh.t7:cmlat will resonate in an open pipe of length 2L?

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
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 01v 52shm pebawif ax);g(n kl5,cnj95.80 m. If the velocity of sound in air is 340 m/s, what ismv ,asi5h5 pb51g )alxnk9e;fn2(w jc the frequency of the second harmonic?

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
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 temd0*to l0 lf7uzperature 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. Whz(n+.g7cy t79bg xnn w;zxhi6at is the freq.;nxxwzz7tn c7b96nggyh+( i uency 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 that hm/ n9 l ruykjy-uf-*(will have a fundamental frequency of 60 Hz on a day w yj*--yu frhu9 nk(ml/hen 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 room where the temperatsqb025ioy wb1. u0 cchure 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 zd l4g qw2 so4r5*x (t4+xywtuin 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:    
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
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-mpyw *ve.gw3 k4; dcg played when the speed of sound in air is 340 m/s. What is the fundamental frequency?g-k4vmpde3w;yw*g .c

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 ; tghl+ypiwne(*d 62s dr-li+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 fundamental frequency of the closed pipd n 2hltdi+yl;we6*+ps g(ri- e?

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 Hzqsaph tm/ a8 9tyhz.;* 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 the sources would hear samy p.*tq8;9ta/hz hno 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 sf8h0n4:g(vkwdkked( 3jq*n *q9 jp xuame 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? ( ud *g8hd jqn((nx0fk3vk*kpj49w: e qThe 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 lz kn 1/hjd9mz- :(hwyHz. 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 t-tx z,;b,os;w6 kdikqune the frequency of a musical instrument. If the tuner hears a beatsx,w db;zq6;-kt ,oki 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 produced by two horns are 0ojue j e(m/jq fh;78m6 m and 7 m respectively. What beat frequency is heard when the horns are 0 j87;e(j fmq /huejmosounded 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 strings on tw7gqzy s27ktp6xy 4a(ro violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 4a q7xstg r7 zykp(26y660 Hz is played. What percentage change in the 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 source at twitna,r8xt tk6d12 mt.iw 59 anfce the speed of sound. The observer hears a frequtt, 1kmadn962 i5anxf8 ttrw.ency 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 Hzz gd76a7.xbca) approaches a stationary observer at one-half the speed of sound. The observer hears a frequencyga.x az7bc d67 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 listek5y 6smmiv4 r7vqnpc c4(y1t)vn-0nio7bth 5ner moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The souo 157y i0ncnhkvc7v- y)6vm4rnt4s mqpi(5 btnd 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 atb2b q/q8lo m(w 9ab7n-.of cqo 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and pas2q(q bmof9lb.bqac87w - / oonses 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 42q ) mb8,fsj-b .fn o-teoikpa stationary observer when a train approaches with a speed of 30 m/s2,es nb4 -off)bikqp .8mto-j . 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 120q/ a x*/- 4z5p*f dn n)9dgys kadgluxrni-.g* km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 34) *a ukx-glxg/qnp dgr/*-zsn 9an*dy.idf45 0 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 toward a 7 v-qacwv85zystationary train. The train blows its 400-Hz whistle. Take the speed of sound cwy 5z q7-vav8to 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 120 km/h. The train blows its 400-Hz 7g8+ujtp:rxb* q( is cwhistle. Take the speed of sound to be 340 m/s. Whatj7ci:* 8sg btq+pru(x 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 aolog:,)j gjy 6s v2atwxv3f;2 t 120 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 is the actual frequency of the whistlfxsl2)o:y;vgtj, ojg3wv6a2 e?

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
82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of a traix;mv8aejfgp.9zc+x 2io+ ji3n horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the train with a speed of a+ +3fjz x o pvic92m8jx;g.ie30.0 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 zq +r*h ikn*jbft)1x)the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speed of 30.iqt jk) f1h*rb+*z)x n0 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,6sc/ 1v- jkycu and a 42-kHz signal i6c/kc- vy1 ujss returned. 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 produced by a supersonic 9 ,se4nhw5 al7p):s/tvghz u;ow tvh /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 is the half-anglel9.s+b7fzgc k of the conical shock wave .lz kg+fb7c9sformed?

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 6/011q reke;h yk/qjlvx p9ztflies from the United States to Europe with a Mach number of 1.05 where the air tem krep k/1 y9 /0l6vqhtx1qez;jperature 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
    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 06:38 , Processed in 0.472091 second(s), 195 queries , Redis On.