Two train whistles, A and B, each have a frequency of 595 Hz. A is stationary and B is moving toward the right (away from A) at a speed of 31 m/s. A listener is between the two whistles and is moving toward the right with a speed of 16 m/s. No wind is blowing. What is the frequency from B as heard by the listener? The velocity of sound in alir is 350 m/s.
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- 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 MaterialsA car approaches a reflective wall. A stationary observer behind the car hears a sound of frequency f₁ from the car horn and a sound of frequency f₂ coming from the wall. (a) What is the ratio of the car's speed to the speed of sound in air in terms of f₁ and f₂? (b) What is the frequency of the car's horn in terms of f₁ and f₂? (c) Now consider that the local speed of sound is 340 m/s, and that the car's horn has a frequency of 500 Hz. If the observer hears 30 beats per second, what is the car's speed?Early Doppler shift experiments were conducted using a band playing music on a train. A trumpet player on a moving railroad flatcar plays a 320-Hz note. The sound waves heard by a stationary observer on a train platform hears a frequency of 350 Hz. What is the flatcar’s speed in mph? The temperature of the air is TC = 22°C .
- A woman is riding a bicycle at 18.0 m/s along a straight road that runs parallel to and right next to some railroad tracks. She hears the whistle of a train that is behind. The frequency emitted by the train is 840 Hz, but the frequency the woman hears is 778 Hz. Take the speed of sound to be 340 m/s. What is the speed of the train, and is the train traveling away from or toward the bicycle?While driving down the road, you spot a friend standing on the sidewalk. You honk your horn at them while driving 60 km/h. Your horn emits a frequency of 330 Hz. V sound = : 343 m/s a. What frequency does your friend hear as you approach? 347 Hz b. What frequency does your friend hear after you pass by? 315 HzA monorail train approaches a platform at a speed of 10.0 m/s while it blows its whistle. A musician with perfect pitch standing on the platform hears the whistle as ‘middle C’, a frequency of 261 Hz. The sound speed is 331 m/s. There is no wind and the surrounding temperature is 27°C. What is the observed frequency of the whistle when the train is at rest?
- Two motors sitting near each other in a factory at slightly different rates. One runs at 805.0 rpm and the other at 775.0 rpm. You hear the combined sound intensity from the motors increase and then decrease periodically due to wave interference. What is the period of beats in seconds?A stationary listener hears frequency f1 from a source moving directly toward the listener with a speed of 20.0 m/s. When the listener then moves directly toward the source with a speed of 30.0 m/s, the detected frequency f2 differs from f1 by 33.0 Hz. What is the frequency (in kHz) of the source? Take the speed of sound to be 340 m/sTwo people are moving in opposite directions relative to each other. One person is playing a trumpet with a frequency of 403 Hz. If the person with the trumpet has a speed of 33.4, moving away from the other person, what must the speed of the other person be if they are to perceive the trumpet sound as having a frequency of 361 Hz? Your answer here can be positive or negative depending on relative motion towards or away. Assume that it is 20 °C. Towards = + Away = -
- Two 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 red train is stationary and a green train is moving forward away from the red train at a speed of 28 m/s. Between the trains, is a bicyclist moving towards the stationary red train at a speed of 15.3 m/s. each train has a whistle with a frequency of 349 Hz. the air temperature is 2 degrees celsius. What are the frequencies of the whistles heard by the bicyclist, coming from the green and red trains? PLEASE INCLUDE UNITS AND ROUND TO 4TH DECIMALS PLACE.On a local road, there are a Honda moving at 72 km/h and a Porsche moving at 90 km/h, approach each other. The driver of the Honda seeing the Porsche was excited, so he honked with a frequency of 650 Hz. If the speed of the sound waves in air is 350 m/s, then what is the frequency of sound heard by the driver of the Porsche? Hint: In this case, we have a moving observer, moving toward the source; thus, for calculation, the velocity of the observer, Vobs should be positive.