0 Members and 1 Guest are viewing this topic.
modern commercial turbines rotate more slowly (roughly 35 r.p.m.) producing a frequency of no more than 1.75 Hz, well below the threshold known to trigger photoepileptic seizures [Which they ascribe to frequencies of 3-30Hz]
The intensity of the pressure wave emitted is measured in decibels (dB), which is usually recorded as a logarithmic scale to account for the enormous range of frequencies at which sound is audible to the human ear, i.e. 20–20,000 Hz