The following physics responses are provided by a student and, as such, should be considered in that context. While every effort is made for accuracy, absolute correctness cannot be fully guaranteed.
|14||When two sound waves are out of phase by ____, destructive interference will occur.||540°|
|14||Which of the following ranges corresponds to the longest wavelengths?
4) all have the same wavelengths
5) both choices A and B are valid||infrasonic|
|14||While standing at a crosswalk, you hear a frequency of 560 Hz from an approaching police car. After the police car passes, its frequency is 480 Hz. What is the speed of the police car? (speed of sound = 340 m/s)||26.2 m/s|
|14||You stand by the railroad tracks as a train passes by. You hear a 1 000-Hz frequency when the train approaches, which changes to 800 Hz as it goes away. How fast is the train moving? The speed of sound in air is 340 m/s.||37.8 m/s|