Doppler Effect: f\' = f (1 plusminus u/c) Malus Law: I = I cos^2 theta The elect

Question

Doppler Effect: f' = f (1 plusminus u/c) Malus Law: I = I cos^2 theta The electric in an Em wave traveling northeast oscillates up and down. In what plane field does the magnetic field oscillate? a. In the north-south plane b. In the up-down plane c. In the NE-SW plane d. In the NW-SE plane e. In the east-west plane An FM radio station broadcasts at a frequency of 93.3 MHz. a.) If you are driving 120 miles hour, directly away from the radio station, shift would you observe? b.) If you are driving 120 miles/hour, and pass by the radio station, what is the change in frequency you observe?

Explanation / Answer

1. Direction of propagation = E X B

(D) in the NW-SE plane

2. fo = 93.3 MHz

f' = fo (1 +- u/c)

u = 120 x 1609 m / 3600s = 53.63 m/s

(A) as going away from source hence negative sign,

f' = fo (1 - u/c)

deltaf = fo - f' = f u / c

= (93.3 x 10^6 Hz) (53.63) /(3 x 10^8)

= 16.7 Hz

(B) now f' = fo (1 + u / c)

deltaf = f' - fo = fo u / c

= 16.7 Hz

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