Special Relativity Practice
10 problems · instant feedback · full explanations
The speed of light is the same for everyone. That single fact forces time and length to be relative — follow the Lorentz factor γ.
Q1.
The central postulate of special relativity is:
Multiple choice · Easy
Q2.
A spaceship moves at 0.5c relative to Earth. What is its Lorentz factor γ?
Numerical answer · Medium
Q3.
An astronaut's clock ticks 10 µs (proper time) while moving at 0.5c (γ = 1.15). What time does Earth measure?
Multiple choice · Medium
Q4.
Length contraction shortens objects:
Multiple choice · Easy
Q5.
How much energy is contained in 1 gram of mass? (c = 3×10⁸ m/s. Answer in joules.)
Numerical answer (J) · Medium
Q6.
As an object's speed approaches c, its relativistic momentum:
Multiple choice · Hard
Q7.
Two events simultaneous in one frame may not be simultaneous in another frame.
True / False · Easy
Q8.
The twin paradox proves special relativity is inconsistent.
True / False · Medium
Q9.
GPS satellites require relativistic clock corrections of about:
Multiple choice · Hard
Q10.
What is the Lorentz factor γ for a proton moving at 0.99c?
Numerical answer · Hard