A railroad train is traveling at 25 m/s. The frequency of the note emitted by the locomotive whistle is 400Hz. What is the wavelength of the sound from whistle heard from an observer standing at the side of tracks, A) as the train approaches and b) as the train heads away.
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- An alert physics student stands beside the tracks as a train rolls slowly past. He notes that the frequency of the train whistle is 489 Hz when the train is approaching him and 468 Hz when the train is receding from him. Using these frequencies, he calculates the speed of the train. What value does he find? (Assume the speed of sound in air is 343 m/s.) m/s Need Help? Read ItTwo trains on separate tracks move toward each other. Train 1 has a speed of 149 km/h; train 2, a speed of 95.0 km/h. Train 2 blows its horn, emitting a frequency of 500 Hz. What is the frequency heard by the engineer on train 1?A) a guitar player sounds C above middle C (522 Hz) while traveling in a convertible at 35m/s. If the car is coming toward you, what frequency would you hear? Use 343 m/s as the speed of sound. B) repeat the problem above, but with the car moving away from you. What frequency would you hear?
- The figure below shows wave fronts of sound waves from the siren of a police car. Two people on both side of the car are running at 5 m/s to the left. The frequency of the siren is 400 Hz. The person on the left observes a frequency of 388.7 Hz. Speed of sound in air is 340 m/s. a) How fast is the policy car travelling? b) What is the frequency observed by the person on the right? c) What is the wavelength observed by the person on the righ? RA commuter train passes a passenger platform at a constant speed of 37.0 m/s. The train horn is sounded at its characteristic frequency of 336 Hz. (a) What overall change in frequency is detected by a person on the platform as the train moves from approaching to receding? (Indicate whether the frequency increases of decreases with the sign of your answer.) Hz (b) What wavelength is detected by a person on the platform as the train approaches? m Need Help? Read ItA string with total length 10 m and mass 200 g is connected to two poles. The tension in the string is 2 N, and the wind makes the string vibrate with a frequency of 2 Hz. Calculate the wavelength of the resulting wave on the string.