201 Hz Wavelength

How Long Is a 201 Hz Wavelength?

A 201 Hz sound wave has a wavelength of 1.71 meters, 170.75 cm, 5.6 feet (5 feet and 7.23 inches) or 67.23 inches when traveling in air at 20°C (68°F).

The formula for the wavelenght is λ = c/f where:

• c is the celerity (speed) of sound = 343.21 m/s or 1126.03 ft/s in air at 20°C (68°F).
• f is the frequency = 201 Hz

which gives a wavelength λ of 1.71 meters, or 5.6 feet.

201 Hz Wavelength Depending on Temperature

The speed of sound in air depends on temperature. Here is how the wavelenght of a 201 Hz sound wave will vary according to temperature:

Temp (°C)	Temp (°F)	201 Hz wavelength (m)	201 Hz wavelength (ft)
-40	-40	1.5228	4.9961
-35	-31	1.5390	5.0493
-30	-22	1.5551	5.1021
-25	-13	1.5710	5.1543
-20	-4	1.5868	5.2059
-15	5	1.6024	5.2571
-10	14	1.6178	5.3078
-5	23	1.6331	5.3580
0	32	1.6483	5.4077
5	41	1.6633	5.4569
10	50	1.6782	5.5058
15	59	1.6929	5.5542
20	68	1.7075	5.6022
25	77	1.7220	5.6497
30	86	1.7364	5.6969
35	95	1.7507	5.7437
40	104	1.7648	5.7901

201 Hz Half Wavelength and Standing Waves

The half wavelength of a 201 Hz sound wave is 0.85 meters, 85.38 cm, 2.8 feet (2 feet and 9.61 inches) or 33.61 inches when travelling in air at 20°C (68°F).

Modes (or standing waves) will occur at 201 Hz in rooms where two opposing walls (axial mode), edges (tangential mode) or corners (oblique mode) are spaced by a distance d = nλ/2 where:

• n is a natural (positive integer greater than or equal to 1)
• λ is the 201 Hz wavelength = 1.71 meters, or 5.6 feet in air at 20°C (68°F).

201 Hz Standing Waves Distances

n	Distance (m)	Distance (ft)
1	0.85	2.80
2	1.71	5.60
3	2.56	8.40
4	3.42	11.20
5	4.27	14.01
6	5.12	16.81
7	5.98	19.61
8	6.83	22.41
9	7.68	25.21
10	8.54	28.01
11	9.39	30.81
12	10.25	33.61
13	11.10	36.41
14	11.95	39.22
15	12.81	42.02
16	13.66	44.82
17	14.51	47.62
18	15.37	50.42

Given the relatively large 201 Hz half wavelength, standing waves will occur at that frequency in small listening rooms.

You can try to minimze the room modes at 201 Hz by trying different speaker positions, listening positions or by placing bass traps. These can absorb frequencies as low as 63 Hz.

How To Convert 201 Hz To ms

A Hz (Hertz) is a cycle (or period) per second.

Because a 201 Hz wave will ocillate 201 times per second, we can find the time of a single cycle (or period) with the formula p = 1/f where:

• f is the frequency of the wave = 201 Hz

The result will be expressed in seconds, so let's multiply by 1000 to get miliseconds:

1 / 201 Hz * 1000 = 4.98 ms.