The SI standard of length is based on:Group of answer choicesthe distance from the north pole to the equator along a meridian passing through Parisa precision meter stick in Pariswavelength of light emitted by Hg198wavelength of light emitted by Kr86the speed of light
Question
The SI standard of length is based on:Group of answer choicesthe distance from the north pole to the equator along a meridian passing through Parisa precision meter stick in Pariswavelength of light emitted by Hg198wavelength of light emitted by Kr86the speed of light
Solution
The SI standard of length, which is the meter, is currently defined by the speed of light. Specifically, it is defined as the distance light travels in a vacuum in 1/299,792,458 of a second. This definition was adopted in 1983 by the General Conference on Weights and Measures. Prior to this, the meter was defined by the wavelength of light emitted by Krypton-86, and even earlier, it was defined as the distance from the north pole to the equator along a meridian passing through Paris. However, these definitions have been superseded by the current definition based on the speed of light.
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