A white dwarf is always the remnant of a star that ____
a. ejected a planetary nebula
b. was a member of a close binary system
c. failed to ignite carbon
d. failed to ignite helium
e. became a red giant has a mass 20 times larger than our Sun
c
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Compared with the period of satellites in close Earth orbit, the period of satellites orbiting far from Earth is
A) shorter. B) the same. C) longer. D) need more information
At a distance of 15.0 m from a sound source, the intensity level is 60.0 dB. What is the intensity level (in decibels) at a point 2.00 m from the source if the source radiates equally in all directions?
A) 55.7 dB B) 57.5 dB C) 75.5 dB D) 77.5 dB
In semi-crystalline polymers, there is a spike in the specific heat when the crystallites start to _____________.
Fill in the blank(s) with the appropriate word(s).
Radioactivity Basics: When a ?+ particle is emitted from an unstable nucleus, the atomic number of the nucleus
A. increases by 1. B. decreases by 1. C. increases by 2. D. decreases by 2. E. does not change.