Doppler Definition and 713 Threads

relativistic doppler shift I'm trying to show that this equation for the doppler shift for light: f' = [&radic;(1+(v/c))/&radic;(1-(v/c))] * f reduces to &Delta;f/f = -v/c for v<<c So I expanded (1+v/c)^(1/2) = 1 + v/(2c) and (1-v/c)^(1/2) = 1 - v/(2c) dropping higher order terms on the...

My book derives two formulas for Doppler shift. One for when the source moves and one for when the observer moves. What about when both are moving? I tried deriving it myself... but I couldn't :( If you want, you could just give me a hint on how to derive it.

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...

i've been having a tough time trying to solve the following problem. A pulsating star has a period of 3 sec as seen from the rest mass frame of the star. What is the period of the star as measured by an observer traveling 2.2e8 m/s with respect to the star? I assumed that it was simply...

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...

Suppose we have a weightless light source that is moving. Its output light will therefore undergo a Doppler shift. Now, if the lightsource had weight but were static, its light would undergo a red shift. If the light source had weight and were moving, would it undergo both a red shift and a...

I’m on a train sitting next to an open window - it’s a bit stuffy - traveling towards a station. A siren is sounding at the station. As I travel toward the siren its pitch is higher that it would be if I were stood on the platform. Once I have passed the siren and I’m moving away, its pitch...

I am trying to understand how the doppler effect was used when determining that the other stars were moving away from us. I get that the spectral lines observed are shifted and by examining that data we can calculate how fast its moving and if it is towards or away from us. could anyone...

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...