[填空题]
Two violin strings are tune 2nr- 7.3ivfvc xhvv(gd to the a0rc; o3w* wpxsame frequency, 294 Hz. The tension in one string is then decreased by 2.0%. What will be the beat frequency heard when the two strings are played 3x pr cw0;a*owtogether? [Hint: Recall Eq. 11–13.] Hz
