The heaviest nuclei of all are formed:
A) in the horizontal branch.
B) in dense white dwarfs.
C) during nova explosions.
D) in the ejection of matter in the planetary nebula.
E) in the core collapse that set the stage of type II supernovae.
E
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Indicate whether the statement is true or false
A photoheterotroph gets its energy from
A) chemical reactions and its carbon from other organisms B) the Sun and its carbon from other organisms C) the Sun and its carbon from its environment D) chemical reactions and its carbon from its environment
Two parallel beams of light in air strike the surface of a transparent material and the refracted beam 1 is closer to the normal than beam 2 . Which beam is traveling at higher speed in the material, and which beam has the higher index of refraction in the material?
a. beam 1, beam 1 b. beam 1, beam 2 c. beam 2, beam 2 d. beam 2, beam 1
The coil shown in the figure has 2 turns, a cross-sectional area of 0.20 m2, and a field (parallel to the axis of the coil) with a magnitude given by B = (4.0 + 3.0t2) T, where t is in s. What is the potential difference, VA ? VC, at t = 3.0 s?
a.
?7.2 V
b.
+7.2 V
c.
?4.8 V
d.
+4.8 V
e.
?12 V