An image formed when the light rays do not actually pass through the image location, and would not appear on paper or film placed at that location is referred to as a(n)
A)
real image.
B)
virtual image.
C)
imaginary image.
D)
positive image.
E)
negative image.
B
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What are some signs of an active galaxy?
A. The core is very bright. B. Electromagnetic radiation from the core fluctuates rapidly. C. Spectra of the core show that it contains hot gas moving at high speeds. D. The core is very small. E. All of these choices are correct.
Both reflecting and refracting telescopes may use a lens called the eyepiece
Indicate whether the statement is true or false
A concrete wall of a cold storage room measures 3.0 m high, 5.0 m wide, and 20 cm thick
The room temperature is maintained at -10°C and the outside temperature is 20°C The inside wall is to be covered by a layer of wood in order to reduce the rate of heat loss through the wall BY 90 percent. The thermal conductivities of concrete and wood are 0.80 W/m ? K and 0.040 W/m ? K, respectively. Under steady state conditions, the thickness of the layer of wood required is closest to A) 60 mm. B) 70 mm. C) 80 mm. D) 90 mm. E) 100 mm.
The sharply defined boundary that separates the crust from the mantle is called ______________
a. the lithosphere b. the asthenosphere c. the Mohorovicic discontinuity d. none of the above.