Two gases A and B are filled at the same pressure in separate cylinders with movable pistons of radius r A and r B , respectively. On supplying an equal amount of heat to both the systems reversibly under constant pressure, the pistons of gas A and B are displaced by 16 cm and 9 cm, respectively. If the change in their internal energy is the same, then the ratio r A r B is equal to

1. A. 3 2
2. B. 4 3
3. C. 3 4
4. D. 2 3

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