A.5 Galilean and special relativity Quiz
Studying this course? Keep your progress in one place.
Pick an answer for each. Quizzes never use energy.
5 questions, one answer each
Each answer is checked as you go, with why.
See all 5 questions
1. A spacecraft moves at 0.50c and fires a light pulse backwards. Its speed relative to a stationary observer is:
- A. 0.50c
- B. 1.5c
- C. c
- D. 0
2. For v = 0.60c, the Lorentz factor γ is:
- A. 1.25
- B. 1.67
- C. 0.80
- D. 1.60
3. A particle's world line makes 45° with the time axis. Its speed is:
- A. 0.50c
- B. 0.71c
- C. c
- D. Zero
4. A clock moving at γ = 2 measures 3.0 s between ticks in its own frame. A stationary observer measures:
- A. 1.5 s
- B. 3.0 s
- C. 6.0 s
- D. 12 s
5. Which quantity is the same for all inertial observers?
- A. The time between two events
- B. The distance between two events
- C. The space-time interval between two events
- D. The length of a moving rod