The figure shows two point sources of light, A and B. B emits light waves that are +? radians out of phase with the waves from A. A is 3? from P. B is 5? from P. (? is the wavelength.) The phase difference between waves arriving at P from A and B is
a.
0 rad.
b.
? rad.
c.
2? rad.
d.
3? rad.
e.
4? rad.
d
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First Law of Thermodynamics: An ideal gas undergoes an adiabatic process while doing 25 J of work. What is the change in the internal (thermal) energy of the gas?
A. 0 J B. 25 J C. -25 J D. 50 J E. -50 J
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A conducting rod with a square cross section (3.0 cm × 3.0 cm) carries a current of 60 A that is uniformly distributed across the cross section. What is the magnitude of the (line) integral 
around a square path (1.5 cm × 1.5 cm) if the path is centered on the center of the rod and lies in a plane perpendicular to the axis of the rod?
A. 14 ?T ? m B. 75 ?T ? m C. 19 ?T ? m D. 57 ?T ? m E. 38 ?T ? m
What factors does the resistance offered by a piece of conductor depend upon?
A. neither the geometry nor the material of the conductor B. material of the conductor C. only the geometry of the conductor D. both the geometry and the material of the conductor