Question

Q2

Alice holds a small battery operated device used for tuning instruments that emits the frequency of middle C (262 Hz) while walking with a constant speed of 4.23 m/s toward a building which presents a hard smooth surface and hence reflects sound well. (Use 343 m/s as the speed of sound in air.) Determine the beat frequency Alice observes between the device and its echo. (Enter your answer to at least 1 decimal place.) Determine how fast Alice must walk away from the building in order to observe a beat frequency of 3.99 Hz.

Answer 1

V 343s reci e Alice V-VA 3y3ナ4:23 3y 3-4. 23 V+VA \242 V-VA 262 2 3.35 258.01 256-и) -1368.5 52 VA