When observing a star that increases dramatically in brightness, if a plateau is observed in the light curve during the declining phase, the event is probably:
A) a nova.
B) a type I supernova.
C) a type II supernova.
D) fusion in an accretion disk around a white dwarf.
E) fusion in an accretion disk around a neutron star.
C
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A +5.0-µC point charge is 12 cm from a -5.0-µC point charge. What is the magnitude of the electric field they produce at the point on the line connecting them
where their electric potential (relative to infinity) is zero? (k = 1/4??0 = 9.0 × 109 N ? m2/C2) A) 0 N/C B) 12.5 MN/C C) 0.75 MN/C D) 25 MN/C E) 1.5 MN/C
Protostars start off more luminous than the main sequence stars they become
Indicate whether the statement is true or false
What is the value for the total energy that reaches each square meter of Earth from the Sun each second called?
a. Solar constant b. Solar maximum c. Sunspots d. Solar wind
Towering cumulonimbus clouds are a common feature in regions where moist unstable air is heated from below. Such clouds are produced by
A) convectional lifting. B) orographic lifting. C) frontal lifting. D) none of these