d. Again: Assume Particles are fired (continually, as in a machine gun) from Source to Receiver. But Now: Assume that the Receiver is Receding from Source at a speed of 80 m/s relative to the Air. Assume that the Source is stationary relative to the Air. i. Draw a diagram of the situation as you understand it, making sure to label all values and making absolutely sure to explicate the + direction. ii. As measured by the Source, what is the velocity of each of these Particles? iii. As measured by the Source, how far apart are each of these Particles? iv. As measured by the Receiver, what is the velocity of each of these Particles? V. As measured by the Receiver, how far apart are each of these Particles? vi. As measured by the Receiver, what is the firing frequency of these Particles?

d. Again: Assume Particles are fired (continually, as in a machine gun) from Source to Receiver. But Now: Assume that the Receiver is Receding from Source at a speed of 80 m/s relative to the Air. Assume that the Source is stationary relative to the Air. i. Draw a diagram of the situation as you understand it, making sure to label all values and making absolutely sure to explicate the + direction. ii. As measured by the Source, what is the velocity of each of these Particles? iii. As measured by the Source, how far apart are each of these Particles? iv. As measured by the Receiver, what is the velocity of each of these Particles? V. As measured by the Receiver, how far apart are each of these Particles? vi. As measured by the Receiver, what is the firing frequency of these Particles?