As far as know, frequency is not complex and is a positive number
denoted in cycles per seconed like 60 cps.
0 cps is sometimes noted as DC, direct current with frequency of zero.
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Complex frequency is utilized in electric circuits in order to simplify the math, essentially. It is very similar to the use of phasors, except complex frequency can cover all types of inputs, not just sinusoids.
In order to calculate the complex power of a circuit, the conjugate of current is used. The Vrms of the circuit is multiplied by the complex conjugate of the total circuit current.
To calculate the lowest frequency that can be generated using mode 1, we need to divide the crystal frequency by two. So, the lowest frequency that can be generated in this case would be 11.0592 MHz divided by 2, which is equal to 5.5296 MHz.
This question cannot be answered as it gives no reference to the calculation your looking for: Frequency, Range, load, etc.
The wavelength of a frequency is the propagation speed divided by the frequency. A wave of 146 MHz, with a propagation speed of 3x108 m/s (speed of light), has a wavelength of 3x108 divided by 146x106, or about 2 m.