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Relativity questions


jajrussel

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In the thought experiments relativity says that my twin will age differently if he is traveling at eighty seven percent of the speed of light relative to me among other things.

 

If, when he is moving at eighty seven percent of the speed of light, I can measure his vehicle, length,speed, etc. Then I assume he can measure things that pertain to me.

 

My assumption is that he will view me as moving at eighty seven percent of the speed if light. His measurements might mirror my own.

 

Is this asumtion right?

 

Also let's say that before the vast difference in velocity we had agreed to communicate on a specific frequency, so that we can compare our measurements. We set the frequency in our radio. When I measure his speed as eighty seven percent of the speed of light I call him on the radio to confirm my measure.

 

Is that frequency still going to work?

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No. The same frequency is not going to reach you if the other person sends the signal. This is due to Relativistic Doppler Effect.

The Doppler Effect, does that apply equally to my twin?

 

As in, if I see red, he sees red? If I see blue he sees blue?

 

I have forgotten the possible combinations,so I removed the question about direction.

Edited by jajrussel
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