Which particle in the free state is least stable?
a. electron
b. photon
c. neutron
d. proton
c
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Vector = 4.0 m points eastward and vector = 3.0 m points westward. The resultant vector + is given by
A) 7.0 m east. B) 7.0 m west. C) 1.0 m east. D) 1.0 m west. E) 3.5 m west.
Energy Levels: Radio astronomers often study the radiation emitted by a hydrogen atom from a transition between the two hyperfine levels associated with the ground state. This radiation has a wavelength of 21 cm. What is the energy difference between the hyperfine levels? (1 eV = 1.60 × 10-19 J)
A. 5.9 × 10-6 eV B. 5.9 × 10-25 J C. 1.7 × 10-24 J D. 4.7 × 10-25 J
General Questions: The figure shows two boxes, with m1 > m2, that are on a level frictionless surface. We can apply a horizontal force 
either toward the right on m1 or toward the left on m2. The magnitude of the force that the boxes exert on each other is
A. zero newtons in either case.
B. larger if 
is applied toward the right.
C. larger if 
is applied toward the left.
D. the same in either case.
If the plate area, plate separation, dielectric strength, and dielectric constant all are doubled for a parallel plate capacitor, what happens to the maximum voltage for this capacitor?
A. it stays the same B. it doubles C. it quadruples D. it halves E. it quarters