Which of the following hypothetical observations would contradict our theories about the formation and evolution of white dwarfs?
A) discovery of a white dwarf with a surface temperature of 6000 K
B) discovery of a white dwarf with a 1.5 Msun mass main-sequence companion
C) discovery of a white dwarf with a mass 1.5 times that of the Sun (1.5 Msun)
D) discovery of a white dwarf at the center of a planetary nebula
C
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A breadcrumb trail is an example of local navigation.
Answer the following statement true (T) or false (F)
A radioactive substance containing 4.00 × 1016 unstable atoms has a half-life of 2.0 days. What is its activity (in curies) after 1 day?
What will be an ideal response?
The gauge pressure of the water in a swimming pool at 10 ft is __________ the gauge pressure of the water at 5 ft
Fill in the blank(s) with correct word
Which statement is always correct when applied to a charge distribution located in a finite region of space?
a. Electric potential is always zero at infinity. b. Electric potential is always zero at the origin. c. Electric potential is always zero at a boundary surface to a charge distribution. d. Electric potential is always infinite at a boundary surface to a charge distribution. e. The location where electric potential is zero may be chosen arbitrarily.