39 The engine of a race car produces a sound with a frequency of 350 Hz. The car is moving at 85 m/s. If the car is coming towards you, what will you perceive its frequency to be? 470 Hz 420 Hz 380 Hz 360 Hz

A train moving at a speed of 25.0 m/s sounds its whistle, which has a frequency of 4.00 x 10^2 Hz. Determine the frequency heard by a stationary observer as the train approaches the observer if the speed of the sound wave is 345 m/s. 372.97 Hz 431.25 Hz 371.01 Hz O 428.99 Hz 2 One

A train is moving at a speed of 50 m/s with its whistle on, the frequency of the whistling sound being 400 Hz. What should be the approximate frequency heard by a stationary observer as the train approaches the observer. Take the speed of sound as 345 m/s when atmospheric temperature is 24°C. 468 Hz 486 Hz 490 Hz 400 Hz

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A convertible moves toward you and then passes you; all the while, its loudspeakers are producing a sound. The speed of the car is a constant 8.93 m/s, and the speed of sound is 342 m/s. What is the ratio of the frequency you hear while the car is approaching to the frequency you hear while the car is moving away? Number Units > #3 C E m/s 7 8 5 % JU 6 וום & e t y u Apr 30 5 6 0

While sitting next to a road on a calm, warm 27.9ºC evening, you see an ambulance's lights flashing in the distance coming towards you. You hear a frequency of 150 Hz (you have a very keen ear!). However, you know that ambulances have sirens that emit sound at 140 Hz. How fast is the ambulance approaching you, in m/s

Two trains on separate tracks move toward one another. Train 1 has a speed of 120 km/h, train 2 a speed of 65.0 km/h. Train 2 blows its horn, emitting a frequency of 500 Hz. What is the frequency heard by the engineer on train 1? (Assume the speed of sound is 345 m/s.) Hz

The lower limit of the human singing voice is 65 Hz. What is the wavelength of this frequency in 20 °C air? 5.3 m 2.2 x 104 m 65 m 0.20 m

1.  A sound wave propagating in air has a frequency of 220 Hz. What is its wavelength? (The speed of sound in air is 343 m/s.) 0.641 m 4.55 mm 220 m 343 m 1.56 m

Standing at a crosswalk, you hear a frequency of 520 Hz from the siren of an approaching ambulance. After the ambulance passes, the observed frequency of the siren is 436 Hz. Determine the ambulance's speed from these observations. (Take the speed of sound to be 343 m/s.) m/s