One day when the speed of sound in air is 343 m/s, a fire truck traveling at vs = 34 m/s has a siren which produces a frequency of fs = 449 Hz. Randomized Variables vS = 34 m/s f = 449 Hz show answer No Attempt 50% Part (a) What frequency (in Hertz) does the driver of the truck hear? fd = | sin() cos() tan() cotan() asin() acos() atan() acotan() sinh() cosh() tanh() cotanh() Degrees Radians π ( ) 7 8 9 HOME E ↑^ ^↓ 4 5 6 ← / * 1 2 3 → + - 0 . END √() BACKSPACE DEL CLEAR Grade Summary Deductions 0% Potential 100% Submissions Attempts remaining: 3 (4% per attempt) detailed view Hints: 4% deduction per hint. Hints remaining: 1 Feedback: 5% deduction per feedback. No Attempt No Attempt 50% Part (b) What frequency (in Hertz) does an observer hear when the truck is moving away?