In his calculations, Bohr came across a number now called the "Bohr radius". This number is 5.29 X 10-11 m and is
B.
The Bohr radius gives the minimum radius of the hydrogen atom. This minimum radius is the smallest radius of the atom because it describes the radius of the ground state, or the most tightly bound state of the atom.
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Vision Problems: Diego is nearsighted and cannot see things beyond 110 cm from his eyes. What is the focal length of the contact lenses that will enable him to comfortably see distant hills clearly?
A. +50 cm B. -50 cm C. -110 cm D. +110 cm E. -30 cm
A comet’s plasma tail always points directly away from the Sun because __________.
a. of pressure exerted by the fast-moving charged particles in the solar wind b. centrifugal forces throw the tail outward as the comet travels around the Sun c. the comet’s nucleus overheats on the Sun-facing side, forcing energetic jets of gas to shoot out from the dark side d. the tail is left behind as the comet moves through its orbit
Imagine placing two long wires parallel to each other. If conventional currents flow through them in the directions shown, will the wires attract, repel, or exert no net force on each other?
A. Attract each other
B. Repel each other
C. Exert no net force on each other
Water able to be contained in the subsurface depends on
A) permeability. B) porosity. C) chemical composition. D) none of these