An iron stove, used for heating a room by radiation, is more efficient if:
A. its inner surface is highly polished
B. its inner surface is covered with aluminum paint
C. its outer surface is covered with aluminum paint
D. its outer surface is rough and black
E. its outer surface is highly polished
Answer: D. its outer surface is rough and black
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Indicate whether the statement is true or false
A parallel plate capacitor has a paper dielectric having dielectric strength 8.00 kV/mm and dielectric constant 3.00. The plate area is 3000 
and the plate separation is 0.500 mm. If 10.0 V are applied to this capacitor, what is the charge on the capacitor?
A. 50.0 
C
B. 42.0 nC
C. 160 nC
D. 16.0 nC
E. 42.0 C
The potential energy of a spring is 0.3 J when it is compressed 0.04 m to the left of its equilibrium position. This is its leftmost position. What is its kinetic energy at this point?
A. 375 N/m B. -0.3 J C. zero D. 0.3 J
Which of the following waves exhibit interference?
A. Only water B. Only sound C. Sound, water, and light D. Only light E. None of these choices are correct