PLEASE ANSWER ALL QUESTIONS A - E WITH FULL STEPS AND DIAGRAMS;
THIS CONSTITUTES THE LAST ONE of three possible problem choices. You may consult any information on the attached sheet (last page of the exam) in order to help yourself understand. BUT For this problem, use the information directly below (labeled with ***) in order to actually SOLVE. NOTE: The values GIVEN HERE (***) are NOT ALL the same as the values attached. For all parts of this problem, assume: *** Relative to the medium of air, these waves travel at a speed of 400 m/s. *** Relative to the source, both these waves and these particles are emitted at a frequency of 800 Hz. *** Relative to the source, these particles travel at a speed of 400 m/s. a. Assume Waves are transmitted from Source to Receiver. Assume the Source is RECEDING from the Receiver at a speed of 80 m/s relative to the Air. Assume that the Receiver 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 (relative to the Source), what is the velocity of these waves? ili. As measured by the Source, what is the wavelength of these waves? iv. As measured by the Receiver, what is the velocity of these waves? v. As measured by the Receiver, what is the wavelength of these waves? vi. As measured by the Receiver, what is the frequency of these waves? b. Again: Assume Waves are transmitted from Source to Receiver. But now: Assume the Receiver is RECEDING from the 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. Asmeasured by the Source (relative to the Source), what is the velocity of these waves? iii. As measured by the Source, what is the wavelength of these waves? iv. As measured by the Receiver, what is the velocity of these waves? v. As measured by the Receiver, what is the wavelength of these waves? vi. As measured by the Receiver, what is the frequency of these waves? Page 11 of 13 Now: Assume Particles are fired (continually, as in a machine gun) from Source to Receiver. Assume that the Source is Receding from Receiver at a speed of 80 m/s relative to the Air. Assume that the Receiver 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? 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? NOW: Using your own words, your own diagrams and your own numbers, explain as thoroughly, clearly and extensively as you can.... HOW can we use the Doppler Effect in order to test whether a freshly discovered moving stream of some new and elusive kind does or does not consist of individual, discrete, countable, identifiable THINGS?! The more clear, the more specific, the more thorough, the more authentically personal your presentation, the better. Page 12 of 13
