Question

An observer stationed wherer = ro watches a light signal emitted from a point where r = r1. It travels radially inwards and is reflected by a fixed mirror at r = r2, so that it travels back to its point of origin at r = r1. How long does the round-trip take according to the observer at r=ro? (Assume that 2m < r2 <ri <ro.)

Answer 1

Ans:- light, doo for radially travelling = IC (1+ 2m/p), which gives the Co-ordinate time for the round-trip to be amcr crcro 효 sto (23) 5 *["/(r-zmi]an C

dri ₃ Si (1-2m) +2m 2m] .2m) my - Start am man 2 Ź (mi –M3 +2men [(oz.zm) /02-cm] observer at po sees start and finish separated by Same Co-ordinate time at which gives a measured time Ati 42 - - 297% 4t = 2 |- 2017. (19-82 + amin I (2,-2m)/19-2m]) 8 (Aus)