just pick - no explanation needed please

Question 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 figuresQuestion 20 Not yet answered Points out of 1.00 p Flag question Three waves with frequencies of 23Hz, 45Hz, and 80Hz make up a complex wave. This complex wave passes through a bandpass filter which has a lower cut-off of 20Hz and an upper cut-off of 40Hz. Will there be an output wave from the filter and if so which of these will make it through? O a. 23 Hz O b. 80 Hz O c. 45Hz and 80 Hz O d. 45 Hz O e. no outputMatch each of the saw tooth waves on the left (II and V} with the appropriate frequency spectrum on the right (a, b, or c) 5\"?\\ "EW "5 m.) E mm] 0 a. 11h and Va O b. [13 andVb 0 C. [13 andVe 0 d. IIe and Va Question 23 Not yet answered Points out of 1.00 - Flag question The 3rd harmonic of a standing wave on a string with tied ends is 936Hz. What is the fundamental frequency f1= Hz O a. 936Hz O b. 0.363 O c. need the wave speed to calculate O d. 111 Hz O e. 312HzQuestion 27 Not yet answered Points out of 1.00 p Flag question The resonant frequency of a circuit is 800 Hz, and the bandwidth is 200 Hz. The lower cut-off frequency is O a. 1000 Hz O b. 1100 Hz O c. 700 HZ O d. 500 Hz O e. 600 HzQuestion 28 Not yet answered Points out of 1.00 p Flag question A pipe open on both ends has a length of 1.0 m. The speed of sound is 340 m/s. What is the frequency of the third overtone? O a. 680 Hz O b. 340 Hz O c. 170 Hz O d. 510 HzWhich one of these is the frequency spectra of a sine wave? 29 Amplain. A A Frequency. ! O a. D Ob. B O c. A Od. C