An ideal gas starts at pressure P0, volume V0, and temperature T0. Each of the following single–step processes begins from this same initial state. Which process results in the greatest final pressure?
Process 1: Volume is halved while temperature remains T0.
Process 2: Temperature is doubled while volume remains V0.
Process 3: Temperature is doubled and volume is doubled simultaneously.
Process 4: Temperature is tripled while volume is doubled.
a) Process 3 only
b) Processes 1 and 2, tied for the highest pressure
c) Process 4 only
d) Process 2 only