The meter is defined in terms of the speed of ______________
Fill in the blank(s) with correct word
light
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Radio astronomers often study the radiation emitted by a hydrogen atom from a transition between the two hyperfine levels associated with the ground state
This radiation has a wavelength of 21 cm. What is the energy difference between the hyperfine levels? (1 eV = 1.60 × 10-19 J) A) 5.9 × 10-6 eV B) 5.9 × 10-25 J C) 1.7 × 10-24 J D) 4.7 × 10-25 J
The Devonian period is most noted for the
A) ability of certain fishes to breath air. B) ability of certain fishes to move onto land. C) first amphibians. D) great diversification of fishes—some developed lungs, some moved to land, and some became amphibians.
The two lenses in a compound microscope work by
A. both forming virtual images. B. the lens closest to the object forming a real image, and the other lens forms a virtual image. C. both forming real images. D. the lens closest to the object forming a virtual image, and the other lens forms real image.
__________is a unit of distance equal to the distance light travels in 1 year
A) The astronomical year B) The light-year C) A light parsec D) A light meter