Process of Science: Explain how patterns in cosmic abundances (Figure 17.15 in the textbook) fit theoretical predictions for the origin of the elements
What will be an ideal response?
Heavier elements are rarer as they are produced in shorter-lived phases of rare, massive stars. Iron is relatively abundant because its production is energetically favored as the end step of fusion and there is only a short time during the supernova phase when it can be destroyed by fission. The abundances of nuclei with even numbers of protons is greater than neighboring nuclei with odd numbers of protons as expected for nuclear reactions through the addition of helium nuclei.
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When light goes from a material with a lower index of refraction n1 into a material with a higher index of refraction n2 with an angle of incidence of 
which of the following is true?
A. the angle of refraction is more than
B. the angle of refraction is less than
C. total internal reflection may occur
D. the angle of refraction is more than
and total internal reflection may occur
E. the angle of refraction is less than
and total internal reflection may occur
Force on a Wire: A vertical wire carries a current straight up in a region where the magnetic field vector points toward the north. What is the direction of the magnetic force on this wire?
A. downward B. toward the north C. toward the east D. toward the west E. upward F. toward the south
If the velocity of an object is non-zero, can the acceleration of the object be zero?
A. Yes B. No
Although we don't know exactly when clusters, galaxies, or stars began forming, we do know that clusters came first, with galaxies and stars forming later
Indicate whether the statement is true or false