MadSci Network: Physics

Subject: tv trasmission from near light speed ship (cont.)

Date: Thu Oct 28 22:04:41 2004
Posted by Tiago Estill de Noronha
Grade level: 10-12 School: No school entered.
City: No city entered. State/Province: No state entered. Country: Brasil
Area of science: Physics
ID: 1099019081.Ph

I understand and already knew all that was said on the previous reply, but
perhaps I didn't express my self the right way, and also, perhaps didn't
undertand what u've replied the right way, or perhaps u made a mistake on ur reply,
so let me try again
a tv signal, is a radio signal, it depends on the frequency of the
electromagnectic radiation emmited from the broadcast antena,
more details on how a tv wokrs go
and I also know that inorder to measure in what velocity a star is getting near
or farther to us is needed to calculate the shift in the stars emmision of light
(redshift or blueshift) relative to what we expect a stars spectrum would look
like if the star and us were still, due to the doppler effect( doppler effect
affects only frequencies, not speed)
I also am aware of the time dilatation that occurs on very fast speeds (the
twins paradox)
I would like to know then if when we receive a signal from the spaceship
traveling near light speed with its time dilated comming closer to us
(blueshift) and getting far from us (redshift), would the signal after the
correction of the doppler effect(or tunning the tv receiver a couple of notchs
up or down in order to retune the out of tune signal) show us the person movving
slower than we would expect, and I am also curious on how would the oposite be
too( tv signal from earth to spaceship)

thank you

Re: tv trasmission from near light speed ship (cont.)

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