just pick no long explanation please

Question 12 Not yet answered Points out of 1.00 '{I Flag question A piano tuner uses beats between the note and a tuning fork to tune a piano key. His tuning fork oscillates at 160 Hz, and he hears 5 beats per second. What is the frequency of the piano note? 0 a. 155 Hz 0 b. 165 Hz 0 0. either 155 or 165 Hz 0 d. 5H2 Question 15 Not yet answered Points out of 1.00 p Flag question Adam is sitting in a firetruck with the siren on. Jake and Renee are each driving towards the stationary firetruck, and Renee is moving faster than Jake. Rank the frequency of the siren heard (Doppler effect) by the three, from highest frequency to lowest frequency O a. Adam, Jake Renee O b. Adam, Renee, Jake O c. Jake, Renee, Adam O d. Renee, Jake, AdamQuestion 19 Not yet answered Points out of 1.00 p Flag question The glottal frequencies can be seen in the spectra of A B Gain-> Amplitude -> Frequency -> Frequency -> O a. both figures O b. Fig. A O c. Fig. B O d neither figures