[填空题]
Two violin strings are tuned to the s;mf6yuv- d4 ih(oufdbt-3 (i fame frequency, 294 Hz. The s6+xe dn nyi7-tension in one string is then decreased by 2.0%. What will be the beat frequency hea+d n6- yxis7nerd when the two strings are played together? [Hint: Recall Eq. 11–13.] Hz