Examlex
Suppose you observe a star emitting a certain emission line of helium at 584.8 nm.The rest wavelength of this line is 587.6 nm.How fast is the star moving? Is it moving toward you or away from you?
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An organization functioning within the public sector, created by the government to enforce laws, regulations, and oversee activities within a specific area.
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A basic, essential principle or idea that serves as the foundation within a field of study or practice.
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The authority held by governmental agencies or bodies to set and enforce rules, standards, or laws within specific sectors or fields.
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