A motorcycle is travelling at a constant velocity of 30ms. The motor is in high gear and emits a hum of 700Hz. The speed of sound in air is 340ms, and there is no wind.
Part A What is the period of the sound waves emitted from the motorcycle?
Part B What is the distance travelled by the motorcycle during one period of the sound oscillation?
Part C What is the distance travelled by a sound wave in air during one period of oscillation?
Part D The humming of the motorcycle is a sound that is emitted in all directions and, once emitted, it travels in the reference frame of the still air at the speed of sound in air. Consider the emitted sound that is moving directly out in front of the motorcycle's path. Use your answer from parts B and C to determine the wavelength of this sound wave as seen by an observer on the ground.
Part E What is the frequency of the forward-emitted sound from part D, according to an observer on the ground?