What is thought to have caused the craters on Venus?
A) Most are volcanic in origin; some are due to meteoritic impacts.
B) As in the case of Mercury, all the craters are due to meteorite impacts.
C) Because meteorites cannot survive passing through the atmosphere of Venus, all craters must be volcanic.
D) Venus has very few craters and their origin is not known.
E) Venus' craters originated during differentiation.
A
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The proton-proton chain
a. combines two hydrogen nuclei to produce a single helium nucleus and energy. b. splits a helium nucleus to produce 4 hydrogen nuclei and energy. c. is the mechanism that increases the temperature between the photosphere and corona of the Sun. d. is the interactions between protons in Earth's atmosphere that produces auroras. e. produces energy in the core of the Sun in the form of gamma rays, positrons, and neutrinos.
Which of the following is not a unit of power?
A. Watt B. KiloWatt C. Joule/second D. Horsepower E. KiloWatt-hour
While many elemental spectral lines are visible, almost all molecular lines lie in the ________ portion of the spectrum, since they are at much lower energy
A) infrared B) radio C) X-ray D) ultraviolet E) visible light
AC Generator: You are designing an ac generator with a maximum emf of 8.0 V. If the generator coil has 200 turns, each with a cross-sectional area of 0.030 m2, what should be the frequency of the generator in a magnetic field of 0.030 T?
A. 7.1 Hz B. 7.5 Hz C. 8.0 Hz D. 44 Hz