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(20%) Problem 4: A student knows that an ambulance siren has a frequency of fs = 405 Hz. He measures, when the ambulance is approaching him, the frequency fo = 417 Hz. Assume the speed of sound is 343 m/s in this problem. ted ted A 33% Part (a) Input an expression for the ambulance's speed, Vs, in terms of the frequencies and the speed of sound v. Grade Summary VS Deductions 0% ted Potential 100% Late Work % 100% 8 9 HOME Late Potential 100% a d fo 4 5 6 Submissions fs g h 2 3 Attempts remaining: 6 K (3% per attempt) m + END detailed view P t V VO BACKSPACE DEL CLEAR Submit Hint Feedback I give up! Hints: 1% deduction per hint. Hints remaining: 2 Feedback: 0% deduction per feedback. A 33% Part (b) What is this speed, in meters per second? A 33% Part (c) If ambulance is moving away with the same speed as in part (b), what is the wavelength measured by the student in meters