or
Subelement L03b
Waves, Wavelength, Frequency and Bands.
Section L03b
If a dial marked in megahertz shows a reading of 3.525 MHz, what would it show if it were marked in kilohertz?
• 3 525 000 kHz
• 0.003525 kHz
3525 kHz
• 35.25 kHz

Mega is a million, kilo is a thousand. A megahertz is a thousand kilohertz. Converting from megahertz to kilohertz, from large units to smaller, requires more digits, decimal point moves to the right by three positions, a thousand times more.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

One megahertz is equal to:
1 000 kHz
• 100 kHz
• 0.001 Hz
• 10 Hz

Mega is a million, kilo is a thousand. Converting from megahertz to kilohertz, from large units to smaller, requires more digits, decimal point moves to the right by three positions, a thousand times more.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

Electrical energy at a frequency of 7125 kHz is in what frequency range?
• Hyper
• Super-high
• Audio

Frequencies audible to humans range from 20 Hz to 20 000 Hz (AUDIO). Speech frequencies important for intelligibility in communications range from 300 Hz to 3000 Hz. Radio frequencies can reach up to 300 GHz ( 300 000 MHz ): Medium Frequencies 300 kHz - 3000 kHz, High Frequencies 3 MHz - 30 MHz, Very High Frequencies 30 MHz - 300 MHz, Ultra High Frequencies 300 MHz - 3000 MHz, Super High Frequencies 3 GHz - 30 GHz, Extremely High Frequencies 30 GHz - 300 GHz.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

What is the name for the distance an AC signal travels during one complete cycle?
Wavelength
• Wave speed
• Waveform

Wavelength: the distance between successive points of equal amplitude and phase on a wave (for example, crest to crest or trough to trough).

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

What happens to a signal's wavelength as its frequency increases?
• It disappears
It gets shorter
• It gets longer
• It stays the same

Wavelength (lambda) in metres is 300 divided by frequency in megahertz ( i.e., the speed of light divided by the frequency in hertz ). Wavelength and frequency have an inverse relationship.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

What happens to a signal's frequency as its wavelength gets longer?
• It disappears
• It stays the same
• It goes up