In a factory, three machines generate noise having intensity levels of 75 dB, 80 dB, and 83 dB.
(i) If all three are running, then determine the intensity level?
(ii) What must be the length of an organ pipe, open at both ends, when the fundamental frequency is to be 256.5 Hz?
(iii) Determine the fundamental frequency of this organ pipe when the temperature drops to 0.0° C?