Damping experiments on iron were made using a torsion pendulum with a natural frequency of 0.65 cycles/s. The experiments were run at var- ious temperatures and the maximum log decrement was found at 35?C. The activation energy for diffusion of carbon in α-iron is 78.5 kJ/mole. At what temperature would you expect the damping peak to occur if the pendulum were redesigned so that it had a natural frequency of 10 H?