Explain the colors of emission nebulae
What will be an ideal response?
The predominant bright red is the emission from ionized hydrogen, heated to over 3,000 K by the ultraviolet radiation of imbedded O and B type stars. Other colors come from emission lines of other atoms. Some blue light will be scattered by cooler dust particles as well.
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Stars that have ejected a planetary nebula eventually become
a. protostars. b. brown dwarfs. c. white dwarfs. d. red giants.
Multiple-Object Accelerating Systems: A 3.0-kg and a 5.0-kg box rest side-by-side on a perfectly smooth, level floor. A horizontal force of 32 N is applied to the 3.0-kg box pushing it against the 5.0-kg box, and, as a result, both boxes slide along the floor. How hard do the two boxes push against each other?
A. 12 N B. 20 N C. 24 N D. 32 N E. 0 N
If a proton inside the nucleus of an atom suddenly turned into a neutron, while the atom retained its original number of electrons, what properties of the atom would change?
A) only its atomic number B) only its atomic mass number C) only its electrical charge D) both its atomic number and atomic mass number, but not its electrical charge E) both its atomic number and electrical charge, but not its atomic mass number
Initially, a blue automobile has twice the kinetic energy that a red automobile has. Both are braked to a stop; both have the same amount of braking force. The red auto will stop in ________ as the blue auto.
A. half the distance B. four times the distance C. the same distance D. twice the distance E. one fourth the distance