You are waiting for your friend to give you a ride on his new motorcycle. As your friend pulls up the driveway, the brakes squeal loudly. You get on, and then your friend steps on the gas. As the motorcycle accelerates, the engine roars loudly. The high-pitched squeal of the brakes was caused by sound waves, and the equally loud but low-pitched roar of the engine was caused by sound waves.

Consider each of the electric- and magnetic-field orientations given next. in each case, what is the direction of propagation of the wave? a)\vec ein the +xdirection,\vec bin the +ydirection. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction b)\vec ein the -y direction,\vec bin the +x choose+ x direction- x direction+ y direction- y direction+ z direction- z direction c)\vec ein the +z direction,\vec bin the -x direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction d)\vec ein the +y direction,\vec bin the -z direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction