just pick no long explanation needed

Question 1 Not yet answered Points out of1.00 If Flag question At night when the air near the ground is cooler, O a. refraction bends sound waves downwards O b. sound waves will reect from the ground 0 0. sound waves spread uniformly in all directions 0 d. refraction bends sound waves upwards Which of the two sound waves shown is louder? V A B Oa. B Ob. A O c. A and B are equally loud sinusoidsWhich of these spectra describes a square wave? A B # C O a. B O b. C O c. all 3 Od. AQuestion 8 Not yet answered Point; out 0f1.00 '{i Flag question A resonant curve has a peak at 800Hz and a bandwidth of 2OHZ. What is the Q factor of this curve? 0 a. 1600 O b. 80 O 0. 0.025 0 d. 40 0e. 20