(1) (A)You approach a stationary sound source with a speed suchthat the frequency of sound you hear is 17% greater than the actualfrequency. With what speed are you approaching the sound source?Use the speed of sound in air as 343 m/s.
(B)Two trains approach each other on separate but adjacenttracks. Train 1 is traveling at a speed of 31.9 m/s and train 2 ata speed of 27.6 m/s. If the engineer of train 1 sounds his hornwhich has a frequency of 520 Hz, determine the frequency of thesound heard by the engineer of train 2. (Use 343 m/s as the speedof sound. Enter your answer to the nearest Hz.)
(C)Alice holds a small battery operated device used for tuninginstruments that emits the frequency of middle C (262 Hz) whilewalking with a constant speed of 3.38 m/s toward a building whichpresents a hard smooth surface and hence reflects sound well. (Use343 m/s as the speed of sound in air.) (A) Determine the beatfrequency Alice observes between the device and its echo. (Enteryour answer to at least 1 decimal place.) (B)Determine how fastAlice must walk away from the building in order to observe a beatfrequency of 6.59 Hz.
m/s
