A 1200-W toaster draws more current than a 1000-W toaster
Indicate whether the statement is true or false
TRUE
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Two nuclei which share the same atomic number Z always are
a. stable. b. unstable. c. isotopes. d. isobars. e. radioactive.
The hydrogen absorption lines are the strongest in ________ type stars.
A. A B. B C. O D. G
A solar mass star will evolve off the main sequence when:
A) it completely runs out of hydrogen. B) it expels a planetary nebula to cool off and release radiation. C) it explodes as a violent nova. D) it builds up a core of inert helium. E) it loses all its neutrinos, so fusion must cease.
The calibration used to build a distance scale reaching from the size of Earth to the most distant visible galaxies is referred to as the__________
A) distance grid B) distance model C) distance candle D) distance ladder