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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 330 meters per second. If the train is approaching a stationary listener on a windless day at a velocity of 30 meters per second, the whistle frequency that the listener hears is most nearly 0 Hz (8) (B) 110 Hz V-330 V₁ = 30m (A) 90 Hz Displacement (C) 120 Hz (D) 240 Hz (E) 300 Hz

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 330 meters per second. If the train is approaching a stationary listener on a windless day at a velocity of 30 meters per second, the whistle frequency that the listener hears is most nearly 0 Hz (8) (B) 110 Hz V-330 V₁ = 30m (A) 90 Hz Displacement (C) 120 Hz (D) 240 Hz (E) 300 Hz

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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 330 meters per second. If the train is approaching a stationary listener on a windless day at a velocity of 30 meters per second, the whistle frequency that the listener hears is most nearly (A) 90 Hz (B) 110 Hz (C) 120 Hz (E) 300 Hz V-330 =30m Displacement (D) 240 Hz Ала AAA (10.) Two sinusoidal functions of time are combined to obtain the result shown in the figure above. Which of the following can best be explained by using this figure? (A) Beats (B) Doppler effect (C) Diffraction (D) Polarization (E) Simple harmonic motion Questions 11-12 Time 1. D 2. A 3. B 4. D
Transcribed Image Text: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 330 meters per second. If the train is approaching a stationary listener on a windless day at a velocity of 30 meters per second, the whistle frequency that the listener hears is most nearly (A) 90 Hz (B) 110 Hz (C) 120 Hz (E) 300 Hz V-330 =30m Displacement (D) 240 Hz Ала AAA (10.) Two sinusoidal functions of time are combined to obtain the result shown in the figure above. Which of the following can best be explained by using this figure? (A) Beats (B) Doppler effect (C) Diffraction (D) Polarization (E) Simple harmonic motion Questions 11-12 Time 1. D 2. A 3. B 4. D
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