Explain three advantages the Hubble Space Telescope has over all ground-based telescopes
What will be an ideal response?
In space, HST can focus on infrared and ultraviolet waves invisible to ground-based observers. With no air, the seeing for Hubble is always perfect and images are much sharper than when viewed through our turbulent blanket of air, even with the best adaptive optics. As the Hubble orbits the Earth, it can be turned to view anything in the sky and not be limited by the local horizon.
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Making a laser work depends on creating a population inversion, meaning a situation in which:
a. most electrons are in the lower energy state. b. most photons are in the lower energy state. c. more electrons are in a high-energy than a low-energy state. d. the directions of electron motion are reversed, or inverted. e. more photons are in a high-energy than a low-energy state.
Two resistors can be either connected to a battery in series or in parallel. In which case, if either, is the equivalent resistance the smallest?
a) When the two resistors are wired in parallel, the equivalent resistance is less than if they are wired in series. b) When the two resistors are wired in series, the equivalent resistance is less than if they are wired in parallel. c) Both series and parallel wiring will result in the same equivalent resistance. d) It is not possible to know which method of wiring will result in the lowest equivalent resistance without knowing the values of the two resistances.
How is the atmosphere of a planet affected by the rotation rate?
A) Faster rotation rates raise the atmospheric temperature. B) The rotation rate determines how long the planet is able to retain its atmosphere. C) The rotation rate determines how much atmosphere a planet has. D) Faster rotation rates produce stronger winds. E) Faster rotation rates raise surface temperatures and thus determine how much material is gaseous versus icy or liquid.
If you have two molecules of TiO2, how many oxygen atoms would you have?
A) 4 B) 2 C) 3 D) 6 E) none