Why do we know much more about the surface of Mars than that of Venus?
What will be an ideal response?
Venus has a thick cloud cover that prevents us from seeing the surface with visible light. Radar can map the surface, but its longer wavelength means the resolution is worse. Mars' atmosphere is thin enough that we can see surface detail from Earth. Also, we have landed several spacecraft on Mars, some of which have traveled over the surface. The few spacecraft that made successful soft landings on Venus were very short lived.
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Electric charge distributes itself on conducting surfaces
A) with greater concentration on more curved parts. B) such that the electric field inside is zero. C) both of the above D) none of the above
A Geiger counter registers a count rate of 8,000 counts per minute from a sample of a radioisotope. The count rate 24 minutes later is 1,000 counts per minute. The half-life of the radioisotope is
a. 3 minutes. b. 4 minutes. c. 6 minutes. d. 8 minutes. e. 12 minutes.
Water, ImageO, and methane, CImage, have about the same mass and differ by only one type of atom. Why is the boiling point of water so much higher than that of methane?
A) The water molecule is less symmetrical than is the methane molecule. B) The oxygen of a water molecule has two lone pairs of electrons. C) The electronegativity difference between oxygen and hydrogen is greater than the electronegativity difference between carbon and hydrogen. D) all of the above
In a common dc circuit, electrons typically move at the speed of
A) a fraction of a centimeter per second. B) a few meters per second. C) sound. D) light. E) none of the above