For the first question, number 8 i have put up 2 attachment, one with the question the other one with the answer, im not sure of the answers however, so if someone can check to see if theyre right or not, and if not show me how to attain the right answer. thanks For the next question, number 11, ill just show you the question and do the solution right here. 11)a) f1= 320 Hz f2=? f=# of cycles/total time f=14/7 f= 2Hz (this 2 hz is also the beat frequency) fb is beat frequency fb= f2-f1 theres a vertical line for absolute value but i dont know how to type it in f2= f1-fb f2=320 + or - 2 f2= 322 hz or f= 318 hz that was 11a now 11b 11b) f1=320 hz fb=1 hz(the beat frequency if you looked at question is now 1 instead of previous 2 hz) fb = f2-f1 f2=f1-fb f2= 320 + or - 1 f2= 319 hz or f2=321 hz Now how do i know which is the original frequency of tuning fork 2? i dont know what to do next, i dont know which is the right frequency for tuning fork 2.