De ce se schimba lungimea de unda pentru un observator in miscare

 Se schimba pentru ca lungimea de unda e definita ca:


lambda= v/f sau lambda = vT,
unde v=viteza de propagare a undei, f e frecventa si T e perioada undei

Cand un observator se misca fata de o sursa stationara, frecventa aparenta f' si perioada aparenta T' se schimba (efectul Doppler clasic), dar viteza de propagare a undei NU se schimba, pentru ca ea nu depinde decat de proprietatile mediului si NU se compune cu viteza sursei sau a observatorului.

Prin urmare, daca frecventa/perioada undei se schimba, dar viteza nu, lungimea de unda aparenta se schimba si e egala cu:

lambda'=v/f', sau lambda'=vT'


E destul de simplu, dar fizienii relativi nu inteleg asta. Pentru ca ei confunda viteza relativa dintre observator si unda cu viteza undei, si considera lungimea de unda ca fiind invarianta, in loc sa considere viteza undei ca fiind invarianta. De aceea ei nu inteleg de ce viteza luminii e invarianta pentru toti observatorii in miscare. Pentru ca observatorii percep o frecventa si o lungime de unda diferite, din cauza efectului Doppler, dar produsul lor e intotdeauna egal cu viteza de propagare a undei.
 
Nu pentru ca se dilata timpul si se contracta lungimea, cum abereaza ei, ci pentru ca se schimba perioada/frecventa si lungimea de unda, si se ajusteaza reciproc conform ecuatiei undei:

f'lambda'=v  (sau c)

Ei in schimb scriu f'lambda=v+vo, adica iau viteza  undei ca fiind 'viteza undei + viteza observatorului', in timp ce mentin aceeasi lungime de unda pe care o percepe un observator stationar, ceea ce e o gogomanie relativa epocala pentru ca incurca cadrele si confunda viteza de propagare a undei cu viteza relativa dintre observator si unda, compunand in mod aberant vitezele lor.

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