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प्रश्न
Why is the speed of light used to define the metre?
पर्याय
Light is the fastest thing we can see
The speed of light in a vacuum is constant everywhere
Light travels exactly 1 metre per second in a vacuum
It is easier to measure than other quantities
MCQ
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उत्तर
The speed of light in a vacuum is constant everywhere
Explanation:
The constancy of the speed of light (c = 299,792,458 m/s) makes it an ideal reference, it does not change with time, location, or observer, giving us an invariant and precise standard.
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