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[Phys-l] Relativistic elevator



Hi,

there are three figures regarding a relativistic elevator & the equivalence principle in Strobel's Astronomy Notes:

<http://www.astronomynotes.com/relativity/s3.htm> (Scroll down)

Strobel explains the middle figure thus:

"If your elevator is moving at a constant velocity upward relative
to the person outside, you will see the beam of light travel in a
straight-line path angled downward. The person outside still sees
the beam travelling in a horizontal direction."

This would mean, of course, that using the abovementioned arrangement the observer inside the elevator could deduce that he is moving upwards at constant velocity w.r.t. to the source of the light beam. Is this consistent with SR? If it is then the situation must be equivalent to "looking outside".

However, the situation in the third figure would not allow the elevator observer to resolve whether he/she is in a gravitational field or accelerating upwards as implied by the equivalence principle.
This is also what Strobel states.

Regards,

Antti



Antti Savinainen, Ph.D., B.Ed.
Senior Lecturer in Physics and Mathematics
Kuopio Lyseo High School
Finland
E-mail: <antti.savinainen@kuopio.fi>
Website: <http://kotisivu.dnainternet.net/savant/>


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