EEE 241 Arizona State University Relative Velocity Questions

EEE241 – HW-12
P 7-19
Write the boundary conditions that exist at the interface of free space and a magnetic
material of infinite (an approximation) permeability.
P.7-23
The electric field of an electromagnetic wave
𝑧
𝑬 = 𝒂𝒙 𝐸0 co𝑠 [10𝟖 𝜋 (𝑡 − ) + θ]
𝑐
is the sum of E1 and E2 where
𝑧
𝑬𝟏 = 𝒂𝒙 0.03 𝑠𝑖𝑛 [10𝟖 𝜋 (𝑡 − ) ]
𝑐
𝑧
𝜋
𝟖
𝑬𝟐 = 𝒂𝒙 0.04 co𝑠 [10 𝜋 (𝑡 − ) − ]
𝑐
3
Find E0 and .
P.8-3
A Doppler radar is used to determine the speed of a moving vehicle by measuring the
frequency shift of the wave reflected from the vehicle.
a) Assuming that the reflecting surface of the vehicle can be represented by a
perfectly conducting plane and that the transmitted signal is a time-harmonic
uniform plane wave of a frequency f incident normally on the reflecting surface,
find the relation between the frequency shift Δf and the speed u of the vehicle.
b) Determine u both in (km/hr) and in (miles/hr) if Δf = 2.33 (kHz) with f = 10.5 (GHz).