Intensity: The intensity of the waves from a point source at a distance d from the source is I. At what distance from the sources is the intensity equal to 2I?
A. d/2
B. d/
C. d/4
D. d/8
Answer: B
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One kilogram of chilled water at 32°F (0°C) is placed in a freezer which is kept at 0°F (?18°C). Approximately how much electric energy (in kilocalories) is needed to operate the compressor to cool this water to 0°F if the room temperature is maintained at 75°F (24°C)? (LF,ice = 3.33 × 105 J/kg; cice = 2.09 × 103 J/kg?°C)
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