In his 1905 paper [3], Einstein derived the length contraction effect and time dilation from the Lorentz transformation (LT). The following equations summarize these results:

**t’= t/γ, x’= γx and y’= y.**Although both textbooks [4,5] conclude that their example serves as a verification of the phenomenon of relativistic length contraction, comparison of the above two sets of formulas shows that the opposite is the case. In Einstein’s result lengths measured by the

*observer in S*in the x direction are contracted, whereas in the textbook examples, lengths measured by the

*observer in S’*are contracted in all directions. It is clearly necessary to resolve this discrepancy.

1) B. Rossi and D. B. Hall, Phys. Rev.

**59**, 223 (1941).2) B. Rossi, K. Greisen, J. C. Stearns and D. K. Froman, Phys. Rev.

**61**, 675 (1942).3) A. Einstein, Ann. Physik

**17**, 891 (1905).4) R. T. Weidner and R. L. Sells,

*Elementary Modern Physics*(Allyn and Bacon, Boston, 1962), p. 410.5) R. A. Serway and R. J. Beichner,

*Physics for Scientists and Engineers*, 5^{th}Edition (Harcourt, Orlando, 1999), p.1262.
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