Which of the following quantities is always the same to all observers?
A) time intervals
B) the speed of an object
C) the speed of sound
D) the speed of light

Question

Quizplus · Accepted Answer

The speed of light is a constant in the universe, meaning that it remains the same for all observers regardless of their relative motion. This is a fundamental principle of physics and is known as the speed of light postulate. Time intervals, the speed of an object, and the speed of sound, on the other hand, can all vary depending on the observer's perspective and relative motion.

Which of the Following Quantities Is Always the Same to All