If a nucleus decays by ?- decay to a daughter nucleus, which of the following statements about this decay are correct? (There may be more than one correct choice.)
A) The daughter nucleus has more protons than the original nucleus.
B) The daughter nucleus has more neutrons than the original nucleus.
C) The daughter nucleus has the same number of nucleons as the original nucleus.
D) The daughter nucleus has fewer protons than the original nucleus.
E) The daughter nucleus has fewer neutrons than the original nucleus.
Answer: A, C, E
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Charge in an Electric Field: An electron is projected with an initial velocity v0 = 8.4 × 107 m/s along the y-axis, which is the centerline between a pair of charged plates, as shown in the figure. The plates are 1.0 m long and are separated by 0.10 m. A uniform electric field of magnitude E in the +x-direction is present between the plates. If the magnitude of the acceleration of the electron is measured to be 8.9 × 1015 m/s2, what is the magnitude of the electric field between the plates? (e = 1.6 × 10-19 C, melectron = 9.11 × 10-31 kg) 
A. 51,000 N/C B. 45,000 N/C C. 40,000 N/C D. 35,000 N/C E. 29,000 N/C
Two objects are in circular orbits of different radii around the Sun. Which object has the lowest orbital speed?
a. The one closest to the Sun. b. The one farthest from the Sun. c. Once in orbit around the Sun, all objects have the same orbital speed regardless of distance from the Sun. It is the greater radius and greater resulting circumference that causes the object farther from the Sun to take longer to complete an orbit. d. This cannot be found without knowing the relative masses of the objects.
Why is the term "arc" used to describe units of measure for angular distance?
a. To avoid confusion with the minutes and seconds of time b. To describe the arc-shaped distance between the stars c. To distinguish the base unit of 10 per degree d. To distinguish the difference between northern and southern spheres e. To describe the placement of the stars within each hemisphere
Conversion of Units: The radius of the earth is 3963 mi. Which one of the following numbers is closest to the surface area of the earth? (1.0 mi = 1609 m)
A. 4.9 × 107 m2 B. 1.3 × 1014 m2 C. 2.6 × 1014 m2 D. 5.1 × 1014 m2