Quiz 6 (25 mins]. If constants like ir or roots of natural numbers appear, leave them as such. No need to use a calculator (but you are free to do so). Assume that the speed of sound is 340 m/s unless otherwise mentioned. Ea 1. The electric field in a plane EM wave is 10 Vim cos(kz + wt) j. What direction is the wave moving in? [2] Write down the magnetic field vector in this EM wave? [4] 2. A police car moving at 10 m/s emits a sound of frequency 1240 Hz that bounces off a Toyota Camry on the highway moving with a speed of 20 m/s and returns to the police car. If the Camry is moving directly away from the police car, what is the frequency of the sound wave received by the police car? [4] 3. A turntable of radius 1.0 m rotates once per second. Two speakers, each giving off sound of frequency 1000 Hz, are attached to the rim of the turntable at opposite ends of a diameter. What is the greatest beat frequency from this system? [4] (Useful formulae: Emax = CBmax, fl = fs(v + VL)/(v + vs)) otherwise correct