BasicB-006-008-003
What is the wavelength in free space of a 25 MHz signal?
B
Answer
Antennas and feed lines
Type
A
19 metres
B
12 metres
C
39 metres
D
6 metres
Answer Notes
Wavelength in free space can be easily calculated using the standard formula: Wavelength (in metres) = 300 / Frequency (in MHz). The constant 300 represents the speed of light in free space (300,000 kilometres per second).
By dividing 300 by the given frequency of 25 MHz, you get exactly 12. Therefore, a 25 MHz signal has a wavelength of 12 metres.
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The velocity of propagation of radio frequency energy in free space is: