Why is the definition of metre as defined in terms of wavelength of light is better than considered better than that of term of radius of earth?
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▶️The SI unit of distance and displacement is the meter. The meter is now defined in terms of the speed of light.
▶️One meter is the distance light (or any other electromagnetic radiation of any wavelength) travels through a vacuum after 1299,792,458 of a second.
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The metre or meter (American spelling) is the base unit of length in the ... The metre is definedas the length of the path travelled by light in a vacuum in 1/299 792 458 of a second.
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