A Level Wireless >Bands< Wave Calculations |
Wireless Bands |
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Radio Frequencies (RF) begin at about 50 kHz although, experimentally, lower frequencies are in use.
The yellow highlighted areas are more likely to be in the exam.
|
Name |
Frequency Range |
Wavelength Range |
Comments |
AM Channels | Video |
ELF |
extremely low frequency |
3 - 30 Hz |
100 000 - 10 000 km |
|
0 | 0 |
SLF | superlow frequency | 30 - 300 Hz | 10 000 - 1000 km |
|
0 | 0 |
ULF | ultralow frequency | 300 - 3000 Hz | 1000 - 100 km |
|
0 | 0 |
VLF | very low frequency | 3 - 30 kHz | 100 - 10 km |
|
2 or 3 | 0 |
LF | low frequency | 30 - 300 kHz | 10 - 1 km |
|
27 |
0 |
MF | medium frequency | 300 - 3000 kHz | 1 km - 100 m |
|
270 |
0 |
HF | high frequency | 3 - 30 MHz | 100 m - 10 m |
|
2 700 |
3 |
VHF | very high frequency | 30 - 300 MHz | 10 - 1 m |
|
27 000 |
27 |
UHF | ultrahigh frequency | 300 - 3000 MHz | 1m - 10 cm |
|
270 000 |
270 |
SHF | superhigh frequency | 3 - 30 GHz | 10 - 1 cm |
|
2 700 000 | 2 700 |
EHF | extremely high frequency | 30 - 300 GHz | 1 cm - 1 mm |
|
Lots! | 27 000 |
Infra-Red | 300 GHz - 4.3 x 1014 Hz |
|
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Visible Light | 4.3 x 1014 - 7.5 x 1014 Hz |
|
Lots! | Lots! | ||
Ultra-Violet | 7.5 x 1014 - 3 x 1017 Hz |
|
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X-Rays | 7.5 x 1014 - 3 x 1017 Hz |
|
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Gamma-Rays | > 3 x 1019 Hz |
|
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Cosmic Rays | > 3 x 1021 Hz |
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Some of the information in this image is correct.
Subject Name Level Topic Name Question Heading First Name Last Name Class ID User ID
Q: qNum of last_q Q ID: Question ID Score: num correct/num attempts Date Done
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Question Text
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