A)WPHY AM Radio transmits on a frequency of 910 kHz, omnidirectionally, with a p

Question

A)WPHY AM Radio transmits on a frequency of 910 kHz, omnidirectionally, with a power of 40 kW.
What is its wavelength?

B)You live 13 km from the station. What is WPHY's intensity where you live?

C)A simple radio consists of an antenna as "voltage source" and an RCL circuit as tuner. The model shown has a fixed inductance and resistance, and a variable capacitor.

You tune to a lower frequency by increasing C.
The higher the inductance, the higher the resonance frequency.
The higher the resistance, the lower the resonance frequency.

D)If the inductance L is 1.5 mH and the resistance R is 18 Ω, what would the capacitance C have to be to tune in to WPHY?

Explanation / Answer

a. V=Lf

wavelength L=329.67 m

b. Intensity I= power/area =40000/4*3.14*13000*13000 =1.88*10^-5 W/m^2

c. The higher the inductance, the higher the resonance frequency.

d. 0.8mH

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