_________ is a form of electromagnetic radiation produced by rapidly moving electrons spiraling through magnetic fields
a. Lagrangian radiation
b. Accretion
c. Ultraviolet radiation
d. Synchrotron radiation
e. Infrared radiation
d
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Contrast the difficulty in contacting extraterrestrial life using space flight and radio communication. How might each be done? What are the advantages and limitations of each?
What will be an ideal response?
A basketball player jumps to make a basket, and remains in the air for a moment. A sportscaster, talking about the game, then remarks that she has "defied gravity." Which of the following accurately describes the situation?
A) The player did stay in the air in spite of the Law of Gravitation, but a single counter-observation is not enough to warrant revisiting a theory that usually works. B) The player produced enough force with her legs to accelerate up into the air, and gravity brought her back down with an acceleration of 9.8 m/s2. C) The player only seemed to defy gravity, but part of the Universal Law of Gravitation makes an exception for basketball players. D) The player has defied gravity, so scientists must go back into the lab to refine their theory.
If you wanted to know how much the temperature of a particular piece of material would rise when a known amount of energy through the process of heating was added to it, which of the following quantities would be most helpful to know?
A) initial temperature B) specific heat C) density D) coefficient of linear expansion E) thermal conductivity
Bottles of perfume sometimes have thick glass (n = 1.5) walls which give the impression the volume is larger than it is. Assume a cylindrical bottle has an inner radius of 1.0 cm and an outer radius of 2.0 cm. How thick (in cm) would the wall appear if you could see a mark on the inside surface?
a. 0.80 b. 0.51 c. 0.72 d. 80 e. 12