On a prescription for eyeglass lenses, what does the quantity expressed in diopters refer to?
a. The thickness of eyeglass lenses.
b. The limitations of the person's eyes.
c. The width of the eyeglass lens.
d. The strength of eyeglass lenses.
e. The curvature of eyeglass lenses.
d
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A__________is a stellar object with such low mass that it cannot raise its central temperature high enough to sustain hydrogen fusion
A) T Tauri star B) Herbig-Haro object C) brown dwarf D) protostar
The location of a star in the H-R diagram indicates its temperature and intrinsic brightness
a. True b. False Indicate whether the statement is true or false
A container of water is lifted vertically 3.0 m, then returned to its original position. If the total weight is 30. N, how much work was done?
A) 0.18 kJ B) 45 J C) 90 J D) No work was done. E) 0.90 kJ
Why are optical fibers important for communication?
a. They can carry thousands of times the information that wires can. b. Light goes faster than electricity. c. They carry digital information. Wires can't carry digital information. d. all of the above