Describe how the motion of Uranus led to the discovery of Neptune
What will be an ideal response?
Uranus at first was moving faster than predicted, then after 1822 mysteriously slowed down, as it had passed Neptune and was now pulled back by Neptune's gravity. Adams and Leverrier used this perturbation to predict the position of Neptune, which Galle used to telescopically locate its blue disk.
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Laboratory experiments conducted with particle accelerators confirm predictions made by the theory that unifies
A) the electromagnetic and weak forces into the electroweak force. B) the strong, weak, and electromagnetic forces into the GUT force. C) the unification of all four forces into a single "superforce." D) the strong and weak forces into the combined nuclear force.
The most distant objects yet detected in the universe are
a. quasars. b. pulsars. c. superclusters. d. globular clusters.
You are given three radioactive samples (?, ?, and ?) and can only dispose of one. The other two you must keep, one in your hand, the other in your pocket. How would you minimize your exposure risk?
A) keep ? in hand, keep ? in pocket, and dispose of ? B) dispose of ?, keep ? in hand, and keep ? in pocket C) dispose of ?, keep ? in pocket and keep ? in hand D) keep ? in pocket, dispose of ?, and keep ? in hand E) keep ? in hand, dispose of ?, and keep ? in pocket
Fiber optics in a DVD player contain their light by employing total internal reflection. Designers surround the pure glass core with another type of glass, called cladding, that has a different index of refraction from the core.
How should you select a cladding?
A. Cladding must have a larger index of refraction than the core B. Cladding must have a smaller index of refraction than the core