Learning Path
Question & Answer1
Understand Question2
Review Options3
Learn Explanation4
Explore TopicChoose the Best Answer
A
The speed of light is constant regardless of the observer's motion
B
The speed of light varies depending on the medium
C
The speed of light can be exceeded by other particles
D
The speed of light is faster than sound in all situations
Understanding the Answer
Let's break down why this is correct
Answer
In Einstein’s Theory of Relativity the speed of light in a vacuum is always the same value, about 300 000 km per second, no matter how fast the source or observer is moving. This constancy means that if you shine a laser from a moving spaceship, an observer on Earth will still measure the same light speed. The idea that light’s speed is fixed leads to time slowing and lengths shortening for fast‑moving objects. For example, if a spaceship travels at 80 % the speed of light, clocks on board will tick slower relative to Earth’s clocks, but both will agree that light still travels at 300 000 km/s.
Detailed Explanation
Light moves at a fixed rate when measured in empty space. Other options are incorrect because Some think light slows in different materials, but the statement is about a vacuum; No particle can go faster than light in vacuum.
Key Concepts
the speed of light
Topic
Einstein's Theory of Relativity
Difficulty
easy level question
Cognitive Level
understand
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