8 25.3 consequences of Einstein's postulates Macroscopic clocks: In October 1977, Joseph hafele and richard Keating flew four portable atomic clocks twice around the world on commercial airline once in each direction. The prediction of the theory was verified within 10% A few years later, physicist at the university of Maryland carried out a similar experiment with improved precision (1%). 8 25.3 consequences of Einsteins postulates 2. Length contraction Lengths perpendicular to the direction of motion L. Measured using Measured using rulers at rest in rulers at rest in S 0 We can prove the sticks are the same length. 1616 Macroscopic clocks: In October 1977, Joseph Hafele and Richard Keating flew four portable atomic clocks twice around the world on commercial airline, once in each direction. The prediction of the theory was verified within 10%. A few years later, physicist at the university of Maryland carried out a similar experiment with improved precision(1%). §25.3 consequences of Einstein’s postulates 2. Length contraction 1lengths perpendicular to the direction of motion We can prove the sticks are the same length. 0l x′ y′ o′ Measured using rulers at rest in S’ 0l x y o Measured using rulers at rest in S §25.3 consequences of Einstein’s postulates