Concept Items
10.1 Postulates of Special Relativity
 The longitudinal nature of light waves implies this.
 Light shows the phenomenon of diffraction.
 The speed of light is the maximum possible speed.
 All other wave energy needs a medium to travel.
Describe the relative motion of Earth and the sun:
 if Earth is taken as the inertial frame of reference and
 if the sun is taken as the inertial frame of reference.

 Earth is at rest and the sun orbits Earth.
 The sun is at rest and Earth orbits the sun.

 The sun is at rest and Earth orbits the sun.
 Earth is at rest and the sun orbits Earth.

 The sun is at rest and Earth orbits the sun.
 The sun is at rest and Earth orbits the sun.

 Earth is at rest and the sun orbits Earth.
 Earth is at rest and the sun orbits Earth.

10.2 Consequences of Special Relativity
 The particleâ€™s momentum will rapidly decrease.
 The particleâ€™s momentum will rapidly increase.
 The particleâ€™s momentum will remain constant.
 The particleâ€™s momentum will approach zero.
 Both of them will be the same age.
 This is a paradox and hence the ages cannot be compared.
 The age of the twin who traveled will be less than the age of her twin who remained behind.
 The age of the twin who traveled will be greater than the age of her twin who remained behind.
A comet reaches its greatest speed as it travels near the sun. True or falseâ€” Relativistic effects make the cometâ€™s tail look longer to an observer on Earth.
 True
 False