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- Police radar guns measure the speed of moving vehicles by transmitting electromagnetic waves at a vehicle and detecting a Doppler shift in the reflected wave. Suppose a police radar transmits at a frequency of 22.0 GHz and receives a wave reflected from a car moving toward the radar at 69.0 mph. Find the frequency shift Affofs (in Hz) between the observed (received) and source (transmitted) frequencies. HINT -0.019507 ҳ Hz Need Help? Submit Answer Read It ♡The rate of energy flow per unit area of a sinusoidal electromagnetic wave has an peak value of 0.658 W/m2. What is the maximum value of the magnetic field in the wave? (c = 3.00 × 108 m/s, μ0 = 4π × 10-7 T ∙ m/A, ε0 = 8.85 × 10-12 C2/N ∙ m2) Provide the solution:_______x10-8T.A certain 60.0 Hz AC power line radiates an electromagnetic wave having a maximum electric field strength of 45.2 kV/m. (a) What is the wavelength of this very low frequency electromagnetic wave? (b) What is its maximum magnetic field strength?