When middle C on a piano (frequency = 262Hz) is struck, the vibration of the piano string loses half its energy after 4s. (i) What is the decay time for the energy? (ii) What is the Q-factor for this piano wire? (iii) What is the fractional energy loss per cycle? SHM has been going great until this chapter on energy loss. I'm totally lossed. I'd really appreciate if someone could explain how to attempt these questions. Best Regards, Jonathan.