GRE Subject Test: Physics

The GRE Subject Test in Physics assesses knowledge and understanding of undergraduate-level physics concepts and principles.

Advanced Topics

Special Relativity

Physics at High Speeds

Special relativity, proposed by Einstein, transforms how we think about space and time, especially when objects move close to the speed of light.

Key Features

  • Time Dilation: Moving clocks run slower.
  • Length Contraction: Moving objects appear shorter.
  • Mass-Energy Equivalence: Mass and energy are two sides of the same coin.

Real-World Impact

GPS satellites correct for relativity to provide accurate positioning, and nuclear reactions demonstrate mass-energy conversion.

Iconic Formula

The famous \( E = mc^2 \) shows how mass can be converted directly into energy.

Key Formula

\[E = mc^2\]

Examples

  • Why GPS satellites need to adjust their clocks.

  • Energy released in nuclear power plants.

In a Nutshell

Special relativity explains surprising effects at high speeds and connects mass with energy.

Key Terms

Time Dilation
A difference in elapsed time measured by two observers due to relative velocity.
Reference Frame
A perspective from which motion is observed and measured.