What is the energy of an electromagnetic wave that has a frequency of 8.0 x 1015 Hz? Use the equation E = hf, where h = 6.626 x 10-34 J. s.
A. 5.3 x 1018 J
B. 5.3 x 10-18 j
C. 1.2 x 10-49 J
D. 1.2 x 1049

Arefrigerator uses r-134a as the working fluid and operates on the ideal vapor-compression refrigeration cycle except for the compression process. the refrigerant enters the evaporator at 120 kpa with a quality of 34 percent and leaves the compressor at 70°c. if the compressor consumes 450 w of power, determine (a) the mass flow rate of the refrigerant, (b) the condenser pressure, and (c) the cop of the refrigerator. (0.00644 kg/s, 800 kpa, 2.03)