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.
Megahertz (MHz) is a common unit of frequency that represents one million cycles per second and is particularly known for its vital role in telecommunications and computing. The term hertz pays homage to Heinrich Hertz, the first person to conclusively prove the existence of electromagnetic waves. In radio broadcasting, the station dial numbers you tune into represent megahertz, which indicate the carrier frequency of the radio station. For example, a frequency of 101.1 MHz means the wave completes 101.1 million cycles every second!
In computing, the speed of the early personal computers was often measured in megahertz. Though we’ve progressed to gigahertz in modern-day processors, the megahertz era marked some groundbreaking advancements in technology. The original IBM PC, introduced in 1981, had a processor speed of just 4.77 MHz. Today, such performance pales in comparison, revealing the incredible strides in processing power over the decades.
Kilohertz | Megahertz |
---|---|
0
kHz
|
0
MHz
|
1
kHz
|
0.001
MHz
|
2
kHz
|
0.002
MHz
|
3
kHz
|
0.003
MHz
|
4
kHz
|
0.004
MHz
|
5
kHz
|
0.005
MHz
|
6
kHz
|
0.006
MHz
|
7
kHz
|
0.007
MHz
|
8
kHz
|
0.008
MHz
|
9
kHz
|
0.009
MHz
|
10
kHz
|
0.01
MHz
|
11
kHz
|
0.011
MHz
|
12
kHz
|
0.012
MHz
|
13
kHz
|
0.013
MHz
|
14
kHz
|
0.014
MHz
|
15
kHz
|
0.015
MHz
|
16
kHz
|
0.016
MHz
|
17
kHz
|
0.017
MHz
|
18
kHz
|
0.018
MHz
|
19
kHz
|
0.019
MHz
|
20
kHz
|
0.02
MHz
|
21
kHz
|
0.021
MHz
|
22
kHz
|
0.022
MHz
|
23
kHz
|
0.023
MHz
|
24
kHz
|
0.024
MHz
|
25
kHz
|
0.025
MHz
|
26
kHz
|
0.026
MHz
|
27
kHz
|
0.027
MHz
|
28
kHz
|
0.028
MHz
|
29
kHz
|
0.029
MHz
|
30
kHz
|
0.03
MHz
|
31
kHz
|
0.031
MHz
|
32
kHz
|
0.032
MHz
|
33
kHz
|
0.033
MHz
|
34
kHz
|
0.034
MHz
|
35
kHz
|
0.035
MHz
|
36
kHz
|
0.036
MHz
|
37
kHz
|
0.037
MHz
|
38
kHz
|
0.038
MHz
|
39
kHz
|
0.039
MHz
|
40
kHz
|
0.04
MHz
|
41
kHz
|
0.041
MHz
|
42
kHz
|
0.042
MHz
|
43
kHz
|
0.043
MHz
|
44
kHz
|
0.044
MHz
|
45
kHz
|
0.045
MHz
|
46
kHz
|
0.046
MHz
|
47
kHz
|
0.047
MHz
|
48
kHz
|
0.048
MHz
|
49
kHz
|
0.049
MHz
|
50
kHz
|
0.05
MHz
|
51
kHz
|
0.051
MHz
|
52
kHz
|
0.052
MHz
|
53
kHz
|
0.053
MHz
|
54
kHz
|
0.054
MHz
|
55
kHz
|
0.055
MHz
|
56
kHz
|
0.056
MHz
|
57
kHz
|
0.057
MHz
|
58
kHz
|
0.058
MHz
|
59
kHz
|
0.059
MHz
|
60
kHz
|
0.06
MHz
|
61
kHz
|
0.061
MHz
|
62
kHz
|
0.062
MHz
|
63
kHz
|
0.063
MHz
|
64
kHz
|
0.064
MHz
|
65
kHz
|
0.065
MHz
|
66
kHz
|
0.066
MHz
|
67
kHz
|
0.067
MHz
|
68
kHz
|
0.068
MHz
|
69
kHz
|
0.069
MHz
|
70
kHz
|
0.07
MHz
|
71
kHz
|
0.071
MHz
|
72
kHz
|
0.072
MHz
|
73
kHz
|
0.073
MHz
|
74
kHz
|
0.074
MHz
|
75
kHz
|
0.075
MHz
|
76
kHz
|
0.076
MHz
|
77
kHz
|
0.077
MHz
|
78
kHz
|
0.078
MHz
|
79
kHz
|
0.079
MHz
|
80
kHz
|
0.08
MHz
|
81
kHz
|
0.081
MHz
|
82
kHz
|
0.082
MHz
|
83
kHz
|
0.083
MHz
|
84
kHz
|
0.084
MHz
|
85
kHz
|
0.085
MHz
|
86
kHz
|
0.086
MHz
|
87
kHz
|
0.087
MHz
|
88
kHz
|
0.088
MHz
|
89
kHz
|
0.089
MHz
|
90
kHz
|
0.09
MHz
|
91
kHz
|
0.091
MHz
|
92
kHz
|
0.092
MHz
|
93
kHz
|
0.093
MHz
|
94
kHz
|
0.094
MHz
|
95
kHz
|
0.095
MHz
|
96
kHz
|
0.096
MHz
|
97
kHz
|
0.097
MHz
|
98
kHz
|
0.098
MHz
|
99
kHz
|
0.099
MHz
|
100
kHz
|
0.1
MHz
|
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