Question

You are traveling North at 5.00 m/s. A truck is behind you, also traveling North, at 35.0 m/s. The truck blows its horn, which produces an actual frequency of 370 Hz. The truck passes you, and blows its horn again. Below are shown pairs of frequencies, one for before the truck passes and one for after the truck passes. Which of the pairs of frequencies is correct for what you will hear? A. Before, 406 Hz. After, 341 Hz. B. Before, 406 Hz. After, 406 Hz. C. Before, 341 Hz. After, 406 Hz. D. Before, 341 Hz. After, 341 Hz. E. Before, 370 Hz. After, 370 Hz.

Answer 1

the Solution - Suppose truck in the Sound Source which actual frequency is 370 M3. fuppose velacity of truck {source is Ve and the welacity of observer and the actual pequency of Source Let the relacity of it V=244 mldecond · in Vo is ni sound in air Nuo when Source is is approaching the receding observer (that is before the truck pass), frequency appears to the offerner by doppler's law vo) oos n'en V-VS Us 370 344-5 BAA-35 370x 339 309 405.92 IS I 406 Hz.

When obserwer is approaching the receding source, lethat is after the truck pass appearing frequency to the by doppler's law. of server hen Volvo Vrtus ) 344+5 h' 370 344+35 370 x 349 379 n' 340.71 113 n'a 341 M3. Thus option true. A is CA After 341 Haza Before 406 Hz