Buoyancy: A piece of iron rests on top of a piece of wood floating in a bathtub. If the iron is removed from the wood, and kept out of the water, what happens to the water level in the tub?
A. It goes up.
B. It goes down.
C. It does not change.
D. It is impossible to determine from the information given.
Answer: B
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From the viewpoint of an alien astronomer, how does Jupiter affect observations of our Sun?
A) It causes the Sun to move in a small ellipse with an orbital period of about 12 years. B) It makes the Sun periodically get somewhat brighter. C) It makes the Sun appear dimmer when viewed with infrared light. D) It causes the Sun to move in a small ellipse in the sky, with the same ellipse repeated every night.
Which of the following is FALSE?
a) Light, radio, ultraviolet, and gamma rays are all forms of electromagnetic radiation. b) Emission spectra are characterized by narrow, bright lines of different colors. c) An absorption spectrum appears as a continuous spectrum interrupted by a series ofdark lines. d) The energy of a photon is inversely proportional to the wavelength of the radiation. e) The wavelengths of the emission lines produced by an element are different from thewavelengths of an absorption line produced by the same element.
Can anything be done to stretch out the fuel supply for fission nuclear reactors so that such reactors could be used for many more centuries?
A) No, because fission reactors must use uranium, and uranium resources will run out within a century. B) No, because fission reactors must use plutonium, and plutonium resources will run out within a century. C) Yes, by converting the 238U into 235U and then fissioning the 235U. D) Yes, by converting 238U into plutonium and then fissioning the plutonium. E) Yes, by using uranium that is less highly enriched that the uranium fuel in use today.
White light is sent through a prism, and the various colors are separated in typical fashion. Which of the following colors would have the highest index of refraction in this prism?
a. green c. blue b. red d. yellow