[填空题]
Two piano strings ares bi(s)j()2ivn uxjn +4pzc4t supposed ta) kbxh1 s5h7fo be vibrating at 132 Hz, but a piano tuner hears three beats every 2.0 s when they are played tk 1xha)h7f5bs ogether. (a) If one is vibrating at 132 Hz, what must be the frequency of the other ? Hz Hz
(b) By how much (in percent) must the tension be increased or decreased to bring them in tune? % increase %decrease