Page 36 - The Master Handbook Of Acoustics

11
FUNDAMENTALS OF SOUND

1,130
Wavelength (1-3)
Frequency
This relationship is used frequently in following sections. Figure
1-10 gives two graphical approaches for an easy solution to Equation 1-3.

Wavelength
Inches
Feet 12 8 6 4 3 2 1
50 40 20 10 5 2 1
A
20 50 100 200 500 1 k 2 kHz 5 kHz 10 kHz 20 kHz
Frequency - Hz

100

50

30

10
5

B Wavelength, ft. 3
1

0.5

0.3

0.1
10 30 50 100 300 500 1 2 3 4 5 10
Hz kHz

FIGURE 1-10
(A) Convenient scales for rough determination of wavelength of sound in air from
known frequency, or vice versa. (B) A chart for easy determination of the wavelength in
air of sound waves of different frequencies. (Both based on speed of sound of 1,139 ft
per second.)