Wave Behavior C.5 Doppler Effect - 题库网 (tiku.one)

1#

A traveling source produces sound waves nearby a child. The wavefronts of the sound waves and the position of a child are seen in the figure below.

The frequency of the generated sound waves is f. Which of the following is correct for both the direction of motion of the source and the observed frequency of the sound waves by the child?

A. The direction of the motion is Toward the child ; Observed frequency is Less than f

B. The direction of the motion is Toward the child ; Observed frequency is More than f

C. The direction of the motion is Away from the child ; Observed frequency is Less than f

D. The direction of the motion is Away from the child ; Observed frequency is More than f

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案: 查看本题详细解析

进入本题讨论区，参与讨论

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

2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car and a bicycle move in the same direction with speeds of $v_0$ and $v$ respectively as shown in the diagram below.

The car driver uses the horn to warn the cyclist. The frequencies of the sound heard by the car driver and cyclist are $f_o$ and $f$ respectively. Which of the following can be correct when $f_0
I. $v_0\,=\,10\,ms^{−1}$ and $v\,=\,5ms^−1$
II. $v_0\,=5\,ms^{−1}$ and $v\,=\,10ms^{−1}$
III. $v_0\,=\,10\,ms^{−1}$ and $v\,=\,10\,ms^{−1}$

A. $I$ only

B. $ III$ only

C. $I$ and $II$ only

D. $I$ and $III$ only

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案: 查看本题详细解析

进入本题讨论区，参与讨论

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

3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A geostationary satellite is used for TV broadcasting. Itfm)qh d/ 9;iqrh;i9 fz9jq5x y orbits so that its position remains fixed above a receiver on earth. It undergoes circular motion with a speed of v and the emittedymfxqzq9 r5/fidhh)9q9;;ij frequency for a channel is f. Which of the following is correct?

A. The observed frequency by the receiver is less than f.

B. The observed frequency by the receiver is more than f.

C. The observed frequency by the receiver is equal to f.

D. The observed frequency by the receiver is equal to $f(\frac{v}{c}+1)$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案: 查看本题详细解析

进入本题讨论区，参与讨论

标记此题

4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A train is traveling ewg)j1- :pcxi wvwe7/ at $30\,ms^{−1}$ towards a stationary observer. It sounds a horn of frequency 450 Hz.
Which of the following statements is true about the observed frequency compared with the emitted frequency as the train approaches?

A. Observed frequency compared to emitted frequency is Lower ; Change in observed frequency over time is No change

B. Observed frequency compared to emitted frequency is Higher ; Change in observed frequency over time is Increases

C. Observed frequency compared to emitted frequency is Lower ; Change in observed frequency over time is Decreases

D. Observed frequency compared to emitted frequency is Higher ; Change in observed frequency over time is No change

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案: 查看本题详细解析

进入本题讨论区，参与讨论

标记此题

5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light source approaches a stationary receiver a0 b 8m a;d6ibsh6t-hdzt an increasing speed. The frequency of the emitted light is constant. Which graph shows how the observed frequency f by receiver varies zb b06a6hdsdhm ti -;8with the speed v of the light source?

A. B. C. D.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案: 查看本题详细解析

进入本题讨论区，参与讨论

标记此题

6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A fire truck’s siren emits a frequency0safnxu u3+b,mm)2,lusfj f / of $f_0$. Starting from rest, it moves with constant acceleration and passes a stationary observer at $t=t_o$. Which graph shows the variation of observed frequency f by the stationary observer with time?

A. B. C. D.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案: 查看本题详细解析

进入本题讨论区，参与讨论

标记此题

7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car drives along a straight road. Radio waves of frequencxow onou,bgwrm 5 8863y $f_o$ emitted from an antenna located at one end of the road are received by the car. The graph shows how the observed frequency $f$ by the car varies with time $t$.The graph shows how the observed frequency $f$ by the car varies with time $t$.

What can be stated for the motion of the car?

A. Stationary then approaches the antenna at a constant speed.

B. Moving at constant speed towards the antenna then stationary

C. Accelerates towards the antenna then moves with constant speed.

D. Accelerates towards the antenna then stationary.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案: 查看本题详细解析

进入本题讨论区，参与讨论

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#

填空题 ( 1.0 分) 切至整卷模式搜藏此题

1.(1)According to the big bang theory, the universe is expanding. One of the supporting pieces of evidence for this claim is the receding of galaxies from the earth and themselves. Which wave phenomenon is used in the discovery?

(2)One of the galaxies is receding from the earth at a constant speed. It emits radio waves in different frequencies. The difference between observed frequency by the receiver on the earth and emitted frequency $f$ from the galaxy is $Δf$. Sketch a graph that shows how $Δf$ varies with $f$. (no need to add values on the axis)

(3)State the assumption you made for the answer in (a) (ii)
2.(1)A stationary person by the side of a straight road records the frequency of the siren of an ambulance driving on the road. When the ambulance is not moving, the frequency is $f$.
The graph shows how the recorded frequency $′f′$ varies with time.

Describe the motion of the ambulance that would result in the graph above.
(2)The person decides to record the frequency of the horn of a car while moving in another car. A car of speed $24\,ms^{−1}$approaches another car of speed $s$ from behind on a level road.

The car behind uses its horn to clear its way. The frequency of the emitted sound wave is $10.0\,k\,Hz$ and the speed of the sound wave in air is $340\,ms^{−1}$. Calculate $s$, in $ms^{−1}$ if the detected frequency in the other car is $10.2\,k\,Hz$. s = $ms^{-1}$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案: 查看本题详细解析

进入本题讨论区，参与讨论

标记此题

9#

填空题 ( 1.0 分) 切至整卷模式搜藏此题

An ultrasound source passes by a stationary sound detector with a constant speedtub2 8at8 r,hog 8x 9yf8nb;nx8ftu8gx9hrybxna ot 8b;,28 n of $v$. The angle between the direction of the motion of the source and the line to the detector from the source is $30^{\circ}C$.

1.Describe the Doppler effect.
2.The frequency of the wave emitted by the source is 21 000 Hz. The average speed of ultrasound in the air is $350\,ms^{−1}$
For the orientation shown in the diagram, the detector receives an ultrasound that has a 27 Hz difference in the frequency from 21 000 Hz. Calculate the speed of the source. $u_s$ = $ms^{-1}$

3.The angle between the direction of the motion of the source and the detector is increased up to $90^{\circ}C$ at a steady rate. Sketch a graph that shows how the observed frequency $′f′$ by the detector varies with time $t$. (no need to add values on the axis)

$f_0$′ is the initial detected frequency and $f$ is the frequency of the wave emitted from the source.
2.(1)Another application of the doppler effect is calculating the speed of satellites.

A geostationary satellite is a satellite that is used for broadcasting. Its position is fixed above a stationary television receiver on earth. It undergoes circular motion with a speed of $8.0\,kms^{−1}$ and the emitted frequency for a channel is $3.0\times10^5\,Hz$. What is the frequency that should be set on the television on earth to be tuned with the channel? $10^5\,Hz$

2.While changing the position of a satellite, it approaches the earth at a constant speed. Explain, adding wavefronts to the diagram, any difference between emitted frequency from satellite and received frequency by the television.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案: 查看本题详细解析

进入本题讨论区，参与讨论

标记此题

10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A radio is placed on a turntable. The turntable rotates anticlockwise with constant angular frequency and the frequency of the generated sound waves is $f$. The frequency of sound waves is measured with a detector. The graph shows how the measured frequency $′f′$ varies with time $t$.

What can be the position of the radio at t=0s?

A. B. C. D.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案: 查看本题详细解析

进入本题讨论区，参与讨论

标记此题

11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Ultrasound incident on a moving blood cell reflected and received by a detector.

The frequency of an incident wave is $f$ and the measured frequency by the detector is $′f′$. The angle between the directions of the reflected wave and blood velocity $v$ is $θ$. Which of the following quantities is $′f′$ dependent on?

A. $v$ only

B. $v$ and $f$ only

C. $θ$ and $f$ only

D. $v$, $θ$ and $f$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案: 查看本题详细解析

进入本题讨论区，参与讨论

标记此题

12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of speed $3\,v$ approaches another car of speed $v$ from the rear on a level road.

The car with a speed of $3v$ uses its horn to clear its way. The frequency of the emitted sound wave is $f$ and the speed of the sound wave is $10v$. What is the observed frequency of the sound wave by an observer in the front car?

A. $\frac{2}{3}$

B. $\frac{11}{7}$

C. $\frac{9}{7}$

D. $\frac{10}{7}$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案: 查看本题详细解析

进入本题讨论区，参与讨论

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

账号		自动登录	找回密码
密码			立即注册

未使用图片

本次作答已使用