Doppler effect Definition and 486 Threads

What is the difference in magnitude between the effects of normal doppler effect and doppler effect in accelerated frames, e.g. when the (light)source is accelerating wrt the observer? What is the formula for doppler effect in accelerating frames?

Hi. I am doing a project about the Doppler Effect and I was wondering if someone here could help me. I have a tone source and I need to find the frequency with respect to time. I could use my mp3 player to record this frequency, which will then save it as a .wav file. I was wondering if...

I need to find what the distance between Earth and saturn would be if they were both in a straight line with the sun (both on the same side of the sun). The problem I'm trying to solve involves the doppler effect, and I can work it out if I know that distance. Does anyone know what it is...

Hey, I need a bit of help with the derivation of Doppler's equations as shown in the attached image. (From Fundamentals of Physics) The paragraph where it states "Now let us again consider the situation..." I don't understand why they use vt + vDt I mean, the sound wave would initially have...

I've got 2 qns 1) Student holding a tuning fork vibrating at 440Hz walk away from a wall with a speed of 1.2m/s. What's the freq of the echo the student can hear from the wall? Speed of sound is 330m/s Can i just use Freq= [(330-1.2)/(330+1.2)] (440Hz) to solve 2) A car traveling at 10m/s...

Question: Imagine a space probe has been placed in a circular orbit about a distant planet. The probe emits a continuous radio signal with a wavelength of 8 m. You measure the signal from earth, and find it to have a wavelength that varies regularly between 7.99943 m and 8.00057 m, with a...

How can we apply the doppler effect when the source of sound is coming towards us at supersonic speeds?Is there a mathematical method for it?

Why is it that the extent of the doppler effect on sound depends on whether, for example, you are moving towards the source or the source is moving towards you? Why does this not happen for light?

In "Concepts of modern physics 6/e by arthur beiser", there's a paragraph on pg11 explaining th effec on the observer moving perpendicular to a line between him and the light source. Why is the proper time between ticks to=1/vo?

If you are driving in a car up to a set of trafic lights that are red, how fast would you need to be going to make the lights appear green? (take the velocity of light to be 3x10^8 ms-1 and the wavelength of red light to be 620nm and the wavelength of green light to be 540nm) Ive calculated...

Suppose a sound source S is moving towards a stationary wall and that a listener L1 is moving with the sound source. Describe in a few lines why the reflected sound heard by the listener L1 is Doppler-shifted by about twice the amount that a second listener L2 would hear standing by the wall...

Hi, I am sort of a new to physics. So far I've only been doing motion, up to the formula for average power. However I was reading something in Earth Science as I was going to help someone study for their regents test, you know how school is almost over and all. Then I read about the Doppler...

Hello, There's a problem with the doppler efect that I don't understand. When a object runs at a velocity a little minor than velocity of sound, appears in front of the emisor a group of high frecuence, that in simulators (applets) is increasing in time. This wave, is like a physical...

hey just wondering about the doppler effect and how it is used in meterology, law enforcment and astronomy. I know for law enforcment they use it in radar guns, and astronomy i think for finding the distance of planets? Any other ways it used? and also how is ultra sound used in medicine...

A block with a speaker bolted to it is connected to a spring having spring constant k = 21.0 N/m, as in Figure P17.40. The total mass of the block and speaker is 46.00 kg, and the amplitude of this unit's motion is 0.475 m. Assume that the speed of sound is 343 m/s. Figure P17.40...

Hello. I have a question on Doppler effect. When the wave has the same velocity that the emisor, u have this: f= \frac {\partial {(Vs-Vo)}} {\partial {(Vs-Ve)}} f' In this case, Vs=Ve, f=infinite?

In class we were explained that if the source moves toward the stationary observer f' = f_{0} \frac{v}{v-v_{s}} where f0 is then aturla frequency of the wave, v is hte speed of the wave, and vs is the speed of the source and f' = f_{0} \frac{v_{rel}+v}{v} where vrel is the speed of...

I know which equations to use for solving Doppler Effect problems, so figuring out which is the observer and which is the source and which is moving or stationary is not the problem, the problem I am having is in solving the actual formulas... This question might belong in the math help section...

In the doppler effect equation for sound, measuring frequency, I have the following question: Car 1-20m/s--> Car 2-30m/s--> --POINT A-- With the above "diagram", we have car 1 going at 20 m/s, right, and car two, 30m/s right, with respect to point A (doesn't have to be those values...

I was reading somewhere that the because of the red shift it can be concluded that the galaxies are moving away from us. But still when we talk about stars, red color refers to cooler stars rather than stars moving away from us. Why?

Doppler effect revisited Am I right when I say that the doppler effect formula "f=f0((v+vo)/(v+vs))" is derivated from the classical theorem of speed addition and this is why the doppler effect for light and EM waves is different?

If a source and detector are moving towards one another, for the general doppler equation, would this be considered the source moving or the detector moving?

when observing heavenly objects, there is an important role of doppler effect. but is there a way to distinguish whether the red/blue shift is because of translational, rotational motion or perhaps thermal motion of the atoms?

There is a space shuttle service between Earth and mars. Each spaceship is equipped with two identical lgihts one at the frotn and one at the rear. The spaceships travel at constnat speed u0 relative to Earth such that an observer standing on Earth sees the headlights of an approachin ship as...

Hi everyone, really would love it if someone could help me with this. I think it's probably a very easy problem, only I can't seem to find the right formlula, or understand the only one I found... This is the problem: I'm in my car, driving towards a crossing with a red traffic light...

Assuming the speed of light is constant from all reference points I don't quite understand why the Doppler Effect works for electromagnetic waves. From my understanding, as far as sound is concerned the object "catches up" with the sound wave, increasing the wave's frequency. But how can that...

A while back I was involved in a discussion regarding the difference between the classic Doppler Effect equation and the Relativistic Doppler Effect equation explaining red/blue shift in stars. I went looking for how to derrive both formulas and came across this interesting article that...

I saw in a chapter on special relativity a derivation of the transverse Doppler effect, which seemed okay, but I have a question concerning this: If the motion of a source is always perpendicular to the position vector connecting the observer to the moving source (i.e. the distance remains...

I've tried searching the forums, but to no real avail. Here's my question (it is not really related to the Doppler Effect formulas/equations, or derivations of them): Why is the observed frequency different when you have the source moving towards the observer at a given speed, and when you...

i'm reposting this here because for some reason my post moved to grade k-12 forum... btw this is a first year University physics question... this is from my physics assignment... after pulling half of my hair, i still couldn't figure it out... my answer for part a) is greater and lower...

this is from my physics assignment... after pulling half of my hair, i still couldn't figure it out... my answer for part a) is greater and lower and part b) is same and same... not sure tho... thx 4. Part a) A sister has a ball which she throws toward her brother. The ball is thrown...

Consider a situation in which a light source is stationary with respect to an observer, A. This source emits n photons of frequency f, each of energy E = hf, towards A. Hence, A will be able to detect the energy loss in the source, which is E = nhf. Now, this light source is moving with...

Using the doppler effect: formula: f'=f/(1-V_s/V_0) A train traveling toward you at 120k/h. the train blows its 400Hz whistle. take the speed of sound to be 340m/s. what's the freq? my developments so far... 400Hz/(1-(.340/.343ms) how do i solve the setup is wrong?

Hi All... Who knows the formula of the Dopler´s Effect??Please someone help me.This is a little curiosity that I Have.Regards. BlueIce88

I have a question regarding waves which has been bugging me for a while: "You are given a traveling wave with an equation of the form cos(ax+/-bt) where x and t are position and time as usual, a and b are positive numbers. Explain how you would physically determine the direction that the...