Re: Speed of Light


Dirk Van de moortel wrote:
<nobody1357@xxxxxxxxxxxxx> wrote in message news:1164743509.972942.99020@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

jillbones wrote:
A vessel 300,000,000 meters wide is traveling at near light speed. >
.99 c
Would the time required for a photon to travel from one side of the
ship to the other side be ;

(1) One second according to the ship's clock? or
(2) One second according to a clock on Earth? or
(3) One second according to both clocks? or
(4) Some arbitrary time not related to the nominal speed of light?

regards;

Bill J

I think it's complicated. First of all, 300 million meters as measured
by people on the vessel or earth?

Probably doesn't matter. His ship has a specified width and
surely it is travelling in a direction perpendicular to that width.
So the width has the same value for the ship's frame as for
the Earth's frame.
Since he did not specify the length of the ship (in the direction
of the movement), the length is probably irrelevant, so we can
assume that the signal travels from the front of the ship on
one side to the front on the other side.

Dirk Vdm

oh.. then, 1 second on vessel and >1 second on earth because of
diagonal path.

.

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