As you approach the police car with blaring siren, you hear a change in pitch and frequency. The apparent pitch changes as a result of the Doppler effect. Frequency determines pitch; frequency and wavelength are inversely proportional. You wouldn't "hear" either one. The result is pitch.
D) pitch and frequency.
Answer:
this may be wrong but when i looked it up it said “Seafloor Mapper”
Explanation:
Length of the cord..........................................................
