Shift Definition and 614 Threads

Hi, A Paradigm Shift happens in physics mostly when fundamental concepts of some system are deeply changed by a new theory and/or new experimental results that supporting and/or triggering a new theory for enough long time. Pure Mathematics has no experimental side like physics, therefore...

What is "FOR"? doppler shift? What is "FOR"? I believe it an acronym having to do with the doppler shift? :confused:

Photon Doppler Shift? I am a practicing EE who has used the standard Doppler shift equation for thirty years in radar design; therefore, I am not disputing the correctness of the equation but the "explanation" that is so often given in textbooks. The general explanation always discusses...

The Michelson-Morley experiment is supposed to be able to detect a time difference between the paths of light in a parallel and in a perpendicular path to the aether wind, both two-way paths of the same length. It is argued that, if such time difference exists, it will be revealed as a phase...

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...

http://www.setterfield.org/Redshift.htm Further data came in supporting z quantisation, but the astronomical community could not generally accept the data because the prevailing interpretation of z was that it represented universal expansion, and it would be difficult to find a reason for...

I am looking for some good links on this particular methodology. Anybody have any?

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 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...

what exactly is the blue and red shift? what happens? why does this happens?

Can someone tell me if these statements are right/wrong, and if wrong, why they are wrong? Lets say you have a light (or more generally, EM) source a distance r from a black hole's core, with r > event horizon radius. As you move closer towards the black hole, since the energy of a...

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...

when light hits a object,its image is tranfered from the object it hit until it hits something else.when the light hits our eyes the last image encoded on the light or photons is whatwe see.so light from other stars travels through space until it hits us,that it why we see them because the light...