Each plate of a parallel-plate air-filled capacitor has an area of 0.0020 m2, and the separation of the plates is 0.020 mm
An electric field of 3.9 × 106 V/m is present between the plates. What is the surface charge density on the plates? (?0 = 8.85 × 10-12 C2/N • m2)
A) 35 µC/m2
B) 73 µC/m2
C) 17 µC/m2
D) 52 µC/m2
E) 87 µC/m2
A
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An electron is fired through a pair of deflection plates, which produce a 2.00 cm long region with an electric field of 4000 N/C perpendicular to the electron's initial velocity. If the initial speed of the electron is 
what angle will its new velocity make with the direction of the original velocity?
A. 14
B. 8.0
C. 5.5
D. 4.6
D. 4.6
Elementary Particles: How many quarks are in a tritium isotope, 
H?
A. 2 B. 3 C. 4 D. 6 E. 9
The first attempt to map the Galaxy via star counts was done by:
A) Galileo in 1612. B) William Herschel in the late eighteenth century. C) Edward Barnard with long exposure photos about 1900. D) Harlow Shapley with the RR Lyrae variables in 1920. E) Edwin Hubble with the new 100" Mt. Wilson telescope in the 1930s.
A quantum of electromagnetic radiation is a __________
Fill in the blank(s) with correct word