Suppose You Sound a 1056-Hertz Tuning Fork at the Same

Multiple Choice

Suppose you sound a 1056-hertz tuning fork at the same time you strike a note on the piano and hear 2 beats/second. You tighten the piano string very slightly and now hear 3 beats/second. What is the frequency of the piano string?

A) 1053 hertz
B) 1059 hertz
C) 1056 hertz
D) 1054 hertz
E) 1058 hertz