EXERCISE HINTS: GETTING STARTED | I'M STUCK The assistant adjusts the tension in the same piano string, and a beat frequency of 3.00 Hz is heard whe the note and the tuning fork are struck at the same time. (a) Find the two possible frequencies of the string. flower = :1 Hz fhigher = :l HZ (b) Assume the actual string frequency is the higher frequency. If the piano tuner runs away fror the piano at 3.12 m/s while holding the vibrating tuning fork, what beat frequency does he hear' pm... (c) What beat frequency does the assistant on the bench hear? Use 343 m/s for the speed of sound. pm