World's Ten Most Colorful Flags. Here are ten of the most colorful flags from around the world. While it is fairly common for flags to have just three colors, like the red, white, and blue of the United States or the black, red, and gold of Germany, some flags are much more colorful than that. What makes a flag colorful tends to be a subjective decision, however.
The wind noise spectrum is dominated by the lower. frequencies (< 500 Hz), although at 27 mph when. saturation is present, the wind noise level can be greater. than 60 dB SPL at 8 kHz. It is clear that wind noise is at. high levels at commonly encountered wind speeds and. needs to be suppressed.
The human ear responds to sounds with frequencies in the range from 20 Hz to 20,000 Hz. This is called the audible range of the human ear. Examples of vibrating sources that produce sound in the audible range of frequencies are drums, guitar strings, tuning fork, human vocal cords and diaphragms of loudspeakers. In audible sound waves whose frequencies are less than 20 Hz are in the infrasonic range. Sources of infrasonic waves include earthquakes, thunder, volcanoes and waves produced by vibrating heavy machinery. The hearing ranges of elephants and whales extend into the infrasonic region.