Assignment Status Click here for detailed view Problem Status Class Management H

Question

Assignment Status Click here for detailed view Problem Status Class Management Help HW 12: Waves and Sound (Chapters 16/17) Begin Date: 4/11/2016 3:00:00 PM Due Date: 5/2/2016 11:59:00 PM End Date: 5/31/2016 11:59:00 PM (11%) Problem 7: A fire truck trave 26 m/s has a siren which produces a frequency of f 449 Hz. Assume that sound ing at v travels at 343 m/s in air. Randomized Variables vs 26 m/s 449 GA 50% Part (a) What frequency does the driver hear in Hertz? Grade Summary Deductions 100% Potential sino cos0 tan0 7 8 9 HOME Sub Attempts remaining: 20 cotan 1% per attempt) atano acotana sinho detailed view cosh00 tanh0 cotanh0 Degrees O Radians Submit Hint give up! Hints 1% deduction per hint. Hints remaining: 1 Feedback: 0% deduction per feedback. A 50% Part (b) What frequency does an observer hear when the truck is moving away in Hertz All content E 2016 Expert TA, LLC

Explanation / Answer

Ans :- Vs = 26m/s

f =449Hz ,V = 343m/s

a] fd = f ( V+vd /V+ vs )

= f (343 + 26 /343 + 26 ) = f = 449Hz

b] Fo = f (343 + 0/343 +26) = 417.36Hz

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