Kilohertz (kHz), a unit of frequency equal to 1,000 hertz, is a central part of our digital world. It’s prominently used to measure frequencies of audio signals, radio transmissions, and clock speeds in computers. The human ear can typically hear sounds ranging from 20 Hz to 20 kHz. Interestingly, ultrasonic devices like bat echolocation operate at frequencies well beyond this range, often between 20 kHz and 200 kHz, allowing them sophistication in navigation and hunting that humans cannot directly experience.
In radio broadcasting, AM radio stations operate at kilohertz frequencies, generally between 530 kHz to 1700 kHz, catering to long-distance communication. This contrasts with FM radio, which uses the higher megahertz range. Understanding kilohertz can give insight into how different signals traverse space, influencing everything from global communications to wildlife studies.
The millihertz (mHz) is a unit of frequency equal to one-thousandth of a hertz. While it sounds minuscule, frequencies at this scale have critical applications in science and technology. For example, the Earth’s rotation slows down over time, a phenomenon observable at the millihertz level. Measuring such tiny variations requires precise timing methods, akin to those used in atomic clocks that define international time standards.
In the realm of biology, certain very slow rhythms in the human body, such as some brainwave patterns, occur at millihertz frequencies. Understanding these subtle oscillations can provide insights into sleep cycles and neurological conditions. Millihertz frequencies are also employed in geophysics for monitoring seismic activities and gravitational wave detection, highlighting their significance in uncovering the mysteries of the universe.
| Kilohertz | Millihertz |
|---|---|
0
kHz
|
0
mHz
|
1
kHz
|
1000000
mHz
|
2
kHz
|
2000000
mHz
|
3
kHz
|
3000000
mHz
|
4
kHz
|
4000000
mHz
|
5
kHz
|
5000000
mHz
|
6
kHz
|
6000000
mHz
|
7
kHz
|
7000000
mHz
|
8
kHz
|
8000000
mHz
|
9
kHz
|
9000000
mHz
|
10
kHz
|
1e+7
mHz
|
11
kHz
|
1.1e+7
mHz
|
12
kHz
|
1.2e+7
mHz
|
13
kHz
|
1.3e+7
mHz
|
14
kHz
|
1.4e+7
mHz
|
15
kHz
|
1.5e+7
mHz
|
16
kHz
|
1.6e+7
mHz
|
17
kHz
|
1.7e+7
mHz
|
18
kHz
|
1.8e+7
mHz
|
19
kHz
|
1.9e+7
mHz
|
20
kHz
|
2e+7
mHz
|
21
kHz
|
2.1e+7
mHz
|
22
kHz
|
2.2e+7
mHz
|
23
kHz
|
2.3e+7
mHz
|
24
kHz
|
2.4e+7
mHz
|
25
kHz
|
2.5e+7
mHz
|
26
kHz
|
2.6e+7
mHz
|
27
kHz
|
2.7e+7
mHz
|
28
kHz
|
2.8e+7
mHz
|
29
kHz
|
2.9e+7
mHz
|
30
kHz
|
3e+7
mHz
|
31
kHz
|
3.1e+7
mHz
|
32
kHz
|
3.2e+7
mHz
|
33
kHz
|
3.3e+7
mHz
|
34
kHz
|
3.4e+7
mHz
|
35
kHz
|
3.5e+7
mHz
|
36
kHz
|
3.6e+7
mHz
|
37
kHz
|
3.7e+7
mHz
|
38
kHz
|
3.8e+7
mHz
|
39
kHz
|
3.9e+7
mHz
|
40
kHz
|
4e+7
mHz
|
41
kHz
|
4.1e+7
mHz
|
42
kHz
|
4.2e+7
mHz
|
43
kHz
|
4.3e+7
mHz
|
44
kHz
|
4.4e+7
mHz
|
45
kHz
|
4.5e+7
mHz
|
46
kHz
|
4.6e+7
mHz
|
47
kHz
|
4.7e+7
mHz
|
48
kHz
|
4.8e+7
mHz
|
49
kHz
|
4.9e+7
mHz
|
50
kHz
|
5e+7
mHz
|
51
kHz
|
5.1e+7
mHz
|
52
kHz
|
5.2e+7
mHz
|
53
kHz
|
5.3e+7
mHz
|
54
kHz
|
5.4e+7
mHz
|
55
kHz
|
5.5e+7
mHz
|
56
kHz
|
5.6e+7
mHz
|
57
kHz
|
5.7e+7
mHz
|
58
kHz
|
5.8e+7
mHz
|
59
kHz
|
5.9e+7
mHz
|
60
kHz
|
6e+7
mHz
|
61
kHz
|
6.1e+7
mHz
|
62
kHz
|
6.2e+7
mHz
|
63
kHz
|
6.3e+7
mHz
|
64
kHz
|
6.4e+7
mHz
|
65
kHz
|
6.5e+7
mHz
|
66
kHz
|
6.6e+7
mHz
|
67
kHz
|
6.7e+7
mHz
|
68
kHz
|
6.8e+7
mHz
|
69
kHz
|
6.9e+7
mHz
|
70
kHz
|
7e+7
mHz
|
71
kHz
|
7.1e+7
mHz
|
72
kHz
|
7.2e+7
mHz
|
73
kHz
|
7.3e+7
mHz
|
74
kHz
|
7.4e+7
mHz
|
75
kHz
|
7.5e+7
mHz
|
76
kHz
|
7.6e+7
mHz
|
77
kHz
|
7.7e+7
mHz
|
78
kHz
|
7.8e+7
mHz
|
79
kHz
|
7.9e+7
mHz
|
80
kHz
|
8e+7
mHz
|
81
kHz
|
8.1e+7
mHz
|
82
kHz
|
8.2e+7
mHz
|
83
kHz
|
8.3e+7
mHz
|
84
kHz
|
8.4e+7
mHz
|
85
kHz
|
8.5e+7
mHz
|
86
kHz
|
8.6e+7
mHz
|
87
kHz
|
8.7e+7
mHz
|
88
kHz
|
8.8e+7
mHz
|
89
kHz
|
8.9e+7
mHz
|
90
kHz
|
9e+7
mHz
|
91
kHz
|
9.1e+7
mHz
|
92
kHz
|
9.2e+7
mHz
|
93
kHz
|
9.3e+7
mHz
|
94
kHz
|
9.4e+7
mHz
|
95
kHz
|
9.5e+7
mHz
|
96
kHz
|
9.6e+7
mHz
|
97
kHz
|
9.7e+7
mHz
|
98
kHz
|
9.8e+7
mHz
|
99
kHz
|
9.9e+7
mHz
|
100
kHz
|
1e+8
mHz
|
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