Two converging lenses, the first with focal length 40 cm and the second with focal length 331/3 cm, are separated by 10.0 cm. An object of height 6.0 cm is placed 20.0 cm in front of the first lens. Where is the final image formed?
A. 10 cm before the first lens
B. 50 cm before the first lens
C. 50 cm after the second lens
D. 100 cm after the second lens
E. 331/3cm after the second lens
D. 100 cm after the second lens
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A) T Tauri star B) Herbig-Haro object C) brown dwarf D) protostar
When does a protostar become a true star?
A) when the star is 1 million years old B) when the central temperature reaches 1 million Kelvin C) when nuclear fusion begins in the core D) when the thermal energy becomes trapped in the center E) when the stellar winds and jets blow away the surrounding material
Which one of the following is a physical change?
a. Rusting of iron b. Fermenting of grape juice c. Souring of milk d. Sharpening a pencil
When considering the conduction of electricity, the term cathode refers to
a) a positive wire. b) a neutral aqueous solution. c) a melted ionic compound. d) a negative wire.