for number 9, why is the answer 110 Hz? the only way to get this is if the train’s velocity is in the numerator but using the dopple equation shouldn’t it be in the denominator, as it’s the source of the sound? this is a non graded practice worksheet 9.A train whistle has a frequency of 100 hertz as heard by the engineer on the train. Assume that the velocity of sound in air is 330meters per second. If the train is approaching a stationary listener on a windless day at a velocity of 30 meters per second, thewhistle frequency that the listener hears is most nearly(A) 90 Hz(B) 110 Hz (C) 120 Hz(E) 300 HzV-330=30mDisplacement(D) 240 HzАлаAAA(10.) Two sinusoidal functions of time are combined to obtain the result shown in the figure above. Which of the followingcan best be explained by using this figure?(A) Beats (B) Doppler effect (C) Diffraction (D) Polarization (E) Simple harmonic motionQuestions 11-12Time1. D 2. A 3. B 4. D

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