In one cycle of operation, the thermal energy input to a particular heat engine is 200 joules and the exhaust is 80 joules. The efficiency of this engine is
A) impossible to determine from the given information.
B) 40 percent.
C) 80 percent.
D) 20 percent.
E) 60 percent.
Question 2
The magnetic field of an electromagnetic wave has a peak value of 5.0 10-10 T. What is the intensity of the wave? (c = 3.0 108 m/s, c = 3.00 108 m/s, 0 = 4 10-7 T m/A, 0 = 8.85 10-12 C2/N m2)
A) 1.0 10-13 W/m2
B) 1.5 10-5 W/m2
C) 3.0 10-5 W/m2
D) 2.0 10-13 W/m2
E) 7.5 105 W/m2
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