# Shared Flashcard Set

## Details

Six Ideas That Shaped Physics Chapter 2
Vocab and Concepts from Moore's Six Ideas that Shaped Physics
9
Physics
10/04/2009

Term
 Ether
Definition
 A hypothetical medium. It was theorized that light traveled through this medium at a speed of c (3.00 x 10^8 m/s) relative to the ether just as sound waves travel through air.
Term
 Michelson and Morley experiment and ether
Definition
 Constructed a set up where two beams of light move perpedicularly. Believed that if the ether theory were true, the light moving into the ether wind would move more slowly so it would be delayed in bouncing back to the receiver. Experiment showed no delay so ether idea rejected.
Term
 synchronized
Definition
 Clocks are defined as synchronized when c(tsubb - tsuba) is equal to the distance between the clocks.
Term
 Using light to synchronize clocks
Definition
 Send out a flash of light with the assumption that it will travel at c. Set a clock with a known distance to the time you know it must read when a beam of light moving at c hits it.
Term
 light-second or second
Definition
 the distance that light travels in 1 s of time
Term
 If clock A and clock B are 7.3 light-seconds apart in an inertial reference frame and a light flash leaves clock A when it reads tsuba=4.3 s, what time with the flash arrive at clock B if the two clocks are synchronized?
Definition
 tsubb= (4.3 + 7.3)s =11.6 s
Term
 clock synchronization
Definition
 Two clocks in an inertial reference frame are defined to be synchronized if the time interval (in s) registered by teh clocks for a light flash to travel between them is equal to their separation in s.
Term
 worldline
Definition
 The set of all events occurring along the path of a particle.
Term