Prelim paper question...
Posted 17 May 2006 - 07:48 AM
A fixed mass of an ideal gas has a volume V and an absolute temperature T. Its pressure is doubled by changing its volume and temperature to:
A V/2 and 4T
B V/4 and T/2
C 2V and T/4
D 2V and T/2
E 4V and 2T
thanks in advance
Posted 17 May 2006 - 08:53 AM
A would make it 8 times the pressure. (half the volume doubles, 4 times the temperature quadruples)
B would make it double.
C would make it 8 times less.
It's B becuase
Volume: 2V halves the pressure as the gas has more room, V/2 Doubles.
Temperature: 2T doubles the pressure as the particles speed up and hit the walls twice as often. T/2 lowers temperature lowering kinetic energy and pressure.
This is really hard to explain. You have to imagine those gas model pictures.
Posted 17 May 2006 - 08:57 AM
I decided to just use hypothetical values till i worked out what doubled P (and got the answer B)
Posted 17 May 2006 - 08:58 AM
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