1. A car horn has a frequency of 448 Hz when the car is stationary. If the car approaches a stationary recorder at a speed of 19.0 m/s, what frequency does the device record if the temperature is 20C? What frequency does the device record after the car passes by?

2. If the recorder in question 14 were moving toward the stationary car at 42 m/s, what frequency would it record?

3. A particular note played on a cello has a frequency of 220 Hz. What is the frequency of the third harmonic of that pitch?

4 . While tuning her guitar, a guitarist compares the pitch one string produces to the pitch produced by a string on another guitar. If the second guitar plays a note with a frequency of 330.0 Hz and the first guitar plays a note with a frequency of 335.0 Hz, what is the beat frequency produced?

5 . The two guitars in Question 19 are playing so that the beat frequency between them is 3 Hz. If one of them is playing a frequency of 348 Hz, what are the possible frequencies the other instrument is playing?