The sound spectrum
Sound comprises of molecular vibrations at the audio frequency, ranging from around 20 Hz to 20 kHz. Young people can hear full range of the audio frequencies; older people lose hearing sensitivity at upper and lower extremes. An elderly person can only hear sounds from 50 to 5000 Hz.
 

In music, the audio frequencies are divided into 3 broad, defined vaguely parts, called as bass, midrange, and treble. The bass frequencies begin at 20 Hz and extend to 150 or 200 Hz. Midrange begins at this point, and this extends to 2000 or 3000 Hz. Treble consists of audio frequencies higher than midrange. As the frequency increases, the wavelength becomes shorter. In the air, sound travels at around 1100 ft/s, or 335 m/s. The relationship between the frequency f of a sound wave in hertz, and  the wavelength w_ft  in feet, which is given is as follows:

                                                      w_ft=1100/f
 

In the metric system, relationship between f in hertz and w_m  in meters can be given by
 

                                                      w_m=335/f

The metric formula is valid for frequencies in kilohertz and wavelengths in millimeters. When using the formulas, be sure you do not get the units confused.A sound of 20 Hz has a wavelength of 55 ft, or 16.8 m, in air. A sound of 1000 Hz produces a wave form measuring 1.1 ft (13 in), or 33.5 cm. At extreme treble end of the audio spectrum, a wave is 0.055 ft (2/3 of an inch), or 17 millimeters, long at 20 kHz. In the substances other than air, such as water or metal, above formulas do not apply. There is also some change in speed of sound with changes in air pressure and humidity.

Sound waves 55 ft long behave quite differently than the waves measuring less than an inch, and both of these behave differently than a wave 13 in length. Acoustics engineers should take this matter into consideration while designing sound systems.