Ove Tedenstig, Idungatan 37, 19 551 Märsta/Sweden 30/10-1996 THE DIFFERENCE BETWEEN THE "TRUE" AND THE "FALSE" DOPPLER EFFECT OF LIGHT. When looking at distance stars and galaxies, a red shift is observed in the received light. In present cosmological theories, this effect is interpreted as a dopplereffect of receeding objects. Objects beeing far from us are supposed to travel faster than those objects beeing more near us, that as an effect of the "Big Bang". Case 1) The true doppler effect is associated with an active aether medium, transporting the energy from source to receiver. In this case the medium limits the transmission velocity. Case 2) Supposing a pure particle source ,the velocities of those particles are determined by the output velocity related to the source plus the source's velocity in relation to this system where the measurements are done. Let's calculate the "true" doppler effect in case 1 and the "false" doppler effect in case 2. Case 1) wt = wavelength as produced by the transmitter wr = wavelength as measured by the receiver side ft = frequency of the transmitter = 1/dt c = propagation velocity of wave in aether vt = velocity of the transmitter related to the aether vr = velocity of the receiver related to the aether dt = time interval between two transmitted pulses At the transmitter side : wt = dt.c - dt.vt At the receiver side : wr = wt + vr.dt giving wr = c/fo.(1- (vt-vr)/c) Case 2) In this case, there is no aether. The particles are sent out with velocity "c" in relation to the source and having the velocity c+vt as measured in an outer system in which the source move with velocity vt. For the transmitter side : wt = dt.(c+vt) - dt.vt = dt.c = c/fo = constant Hence, in the particle case, we get no wavelength shift on the transmitter side. The receiver side: The time for an interval to pass the reciever moving with velocity vr in relation to a common reference ( the same as for the transmitter): wt tr = --------- = 1/f c+ vt-vr From that : f = fo.( 1 + (vt-vr)/c) Conclusion: If light is transported in aether, the doppler shift is a true doppler effect, giving shift in wavelength. If light is a stream of particles, the doppler shift is a false effekt, giving shift in frequency. Hence, it may be possible to determine the true essens of the nature of light in this way. The doppler effect in the particle case is received beqause of an invarians in transmitting velocity in relation to the receiving system. However, the thesis of the invariant velocity of light is only true in case of aether and not for particle.