A train makes a stop at a train station. You decide to get out of the train to get some snacks from a vending machine for yourself and a friend who is still in the train. By the time you get your snacks from the vending machine, the train has already started moving and has reached a speed of 10m/s. Your friend starts calling out to you by whistling. His whistling frequency is 800 Hz. What frequency of whistling do you hear? Thanks!

You are standing on a train station platform as a train goes by close to you. As the train approaches, you hear the whistle sound at a frequency of f1 = 94 Hz. As the train recedes, you hear the whistle sound at a frequency of f2 = 77 Hz. Take the speed of sound in air to be v = 340 m/s. Find an equation for the speed of the sound source vs, in this case it is the speed of the train. Express your answer in terms of f1, f2, and v.  Find the numeric value, in meters per second, for the speed of the train.  Find an equation for the frequency of the train whistle fs ("s" is for "source") that you would hear if the train were not moving. Express your answer in terms of f1, f2, and v.

On the planet Arrakis, a male ornithoid sings at a frequency of 1180 Hz. When flying toward her mate at a speed of 30 m/s, a female ornithoid hears the sound at a frequency of 1250 Hz. What is the speed of sound in the atmosphere of Arrakis?

As part of a college physics lab. A car that is giving off a sound with a frequency of 350 Hz, is moving towards a group of students that are standing together (not moving). The students measure the sound coming from the car as 385 Hz. What is the speed of the car?

One day when the speed of sound in air is 343 m/s, a fire truck traveling at vs = 27 m/s has a siren which produces a frequency of fs = 435 Hz. vS = 27 m/sf = 435 Hz A. What frequency (in Hertz) does the driver of the truck hear?  B. What frequency (in Hertz) does an observer hear when the truck is moving away?

sound waves in air ( v = 343 m/s ) has a frequency of 320 Hz. In ocean water, its wavelength is 4.875 m. What is the speed of sound in seawater? 343 m/s 1005 m/s 1300 m/s 1440  m/s 1560 m/s

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

A bat can detect small objects, such as an insect, whose size is approximately equal to one wavelength of the sound the bat makes. If bats emit a chirp at a frequency of 5.89 104 Hz, and if the speed of sound in air is 343 m/s, what is the smallest insect a bat can detect?mm

You've entered the Great Space Race. Your engines are hearty enough to keep you in second place. While racing, the person in front of you begins to have engine troubles and turns on his emergency lights that emit at a frequency of 5.640 x 1014 Hz. If the person in front of you is traveling 2627 km/s faster than you when he turns on his lights, what is the frequency of the emergency lights that you observe when it reaches you in your spaceship? (Enter your answer to four significant figures.) 4.0 Hz Additional Materials

Going down the road at 65 miles per hour on a 86.0 °F summer day, Bari heard a siren approaching. Bari knows that a police siren's frequency is 1280.0 Hz, but it didn't sound like that. Bari pulled over a lane, without slowing down, after seeing the flashing lights of the police car coming up from behind, and the police passed going 25 miles per hour faster than Bari was going. (1 mile = 1.60 km) a) what was the speed of sound on that warm summer day? b) How fast, in m/s, was the police car going? c) What frequency did Bari hear from the siren before the police car passed? d) What frequency did Bari hear from the siren after the police care had passed?