Most of the elements heavier than helium were made during the first few minutes after the big bang
Indicate whether the statement is true or false
F
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A flashlight bulb typically has a small metallic button at one end, and this button is surrounded by ceramic material. The chief purpose of the ceramic material is to
A. provide a conducting path to the filament. B. insulate the metal button from the other contact point. C. shut the filament off if the current gets too high. D. provide extra mass at the bottom of the bulb.
How does a permanent magnet work, i.e., what is the explanation of its magnetic effects?
A) Electric charge is permanently separated within the magnet, with positive static charge at one end and negative static charge at the other end of the magnet. B) Electrons orbiting individual atoms in the magnet are all aligned together so that their orbital motion produces a large overall effect. C) The material of the magnet is highly ionized, with one type of ion residing on one end of the magnet and the other type of ion residing on the other end. D) Subatomic particles known as "magnetic poles" are placed on each end of the magnet, with one type of pole placed on one end and the other type on the other end. E) Magnets are a communist plot.
Glacial striations on the continental landmasses provide evidence
A) that Hawaii was once joined to Alaska. B) of the direction of Pleistocene ice flow. C) that the Cenozoic was a very cool time. D) that Baja California was once joined to Mexico.
A beam splitter in a Michelson interferometer is
A) an extremely sharp knife edge. B) two transparent pipes. C) a half-silvered mirror. D) made of two mirrors. E) made of three mirrors.