Register to reply 
Difference between relativistic doppler effect and classical one?by lightconstant
Tags: doppler effect 
Share this thread: 
#1
Feb1612, 10:15 PM

P: 8

When I ask for differences I am not meaning mathematical ones since that it is obvious:
We have a phenomenon p, p can be described by Galilean Relativity (GR) and by Einsten Relativity (ER). ER(p)!=GR(p) The math expression that describes this phenomenon is different. Then the doppler effect will have another mathematical expression ER(dp)!=GR(p) Maybe someone wants to say that GR is like a subset of ER for small velocities in reality It is not It looks similar but It is not, well let us get to the point. Sound can be described by the classical doppler effect GR(d_e) by addition and substration of velocities though we know the velocity is constant due to the medium. My question can we do the same with light? can we explain it mathematically with the addition of c+v, cv? I hope I have expressed myself clearly, I know c is a constant and We can not add velocities, what am I asking is if by using galilean relativity the doppler effect of light can be explained adding velocities, after all sound has a constant velocity and we add it. Let us put it another way, is there any physical not mathematical proof, evidence, observation, meaning... that the doppler effect of light is different than the sound one? Or Is It just the way It is expressed mathematically. Because I see this applet: http://webphysics.davidson.edu/applets/applets.html and the phenomenon looks the same. 


#2
Feb1612, 10:40 PM

Sci Advisor
PF Gold
P: 5,027

See: http://math.ucr.edu/home/baez/physic..._time_dilation 


#3
Feb1612, 10:47 PM

P: 8

Thank you PAllen I saw that somewhere but did not know it was only light related,
I guess the phenomenon It is not the same since one has transverse doppler and the other one does not. Let me look at it and see what is about. 


Register to reply 
Related Discussions  
Planck relation, relativistic doppler effect, and relativistic mass  Special & General Relativity  4  
Relativistic Doppler effect  Introductory Physics Homework  1  
Relativistic Doppler Effect  Advanced Physics Homework  2  
Relativistic doppler effect  Advanced Physics Homework  10  
Qn on classical doppler effect  Introductory Physics Homework  1 