The Invariance of the Speed of Light

• What is the speed of light in a vacuum?

  3.0 × 10^-8 ms^-1
• What does the term "invariance" refer to in the context of light?

  Speed of light is constant for all observers
• Does light travel faster when emitted from a moving object?

  No, it always travels at 3.0 × 10^-8 ms^-1
• What is the symbol used to represent the speed of light?

  c
• How does the speed of light behave when observed by different observers?

  It remains constant at 3.0 × 10^-8 ms^-1
• Why is the invariance of the speed of light considered counter-intuitive?

  Because nothing can travel faster than light
• If an answer for velocity exceeds 3.0 × 10^-8 ms^-1, what should you conclude?

  Something has gone wrong in calculations
• What are the key points about the invariance of the speed of light?

  • Speed of light in vacuum: 3.0 × 10^-8 ms^-1
  • Constant for all observers
  • Does not change with the motion of the source
  • Only light can travel at this speed
• What are the implications of the invariance of the speed of light?

  • No object can exceed light speed
  • Challenges classical notions of speed and motion
  • Fundamental to the theory of relativity