In general, as the energy of a sound wave increases, a. the sound gets softer and then louder. b. the sound gets louder. c. the sound always remains the same. d. the sound gets softer.

9.98 kg of r-134a at 300 kpa fills a rigid container whose volume is 14 l. determine the temperature and total enthalpy in the container. the container is now heated until the pressure is 600 kpa. determine the temperature and total enthalpy when the heating is completed. use data from the steam tables.