9-12 thank you! I will give great rating

If the intensity how much greater is the intensity of the first sound? 9) If the intensity of a wave is given by I at a distance of one meter from the source, what is the intensity three meters from the source? 10) The lowest harmonic in a pipe open at one end resonates at 330 Hz. What is the next resonant frequency in that pipe? What if the pipe were open at both ends? Where are the displacement nodes and antinodes for the fundamental frequency in each case? 11) What frequency will you hear if an ambulance is approaching at 35 m/s and it has a siren with a frequency of 5000 Hz? 12) Two identical strings held in place at both ends, initially vibrate at the same fundamental frequency of 180 Hz. One of the strings has its tension increased until a beat frequency of 4 Hz is heard. What is the ratio of the tension in the string with the higher tension to that with the lower tension