Question

1. describe how the behavior of waves impacts the pitch of the sound that you hear from an object. use the following terminology to describe waves in your answer: wavelength, frequency and amplitude. type your answer here...

Explanation:

The Doppler Effect involves sound waves (a type of wave). Pitch is related to frequency: higher frequency means higher pitch, lower frequency means lower pitch. Wavelength and frequency are inversely related ($v = f\lambda$, where $v$ is wave speed, $f$ is frequency, $\lambda$ is wavelength). When a sound - producing object moves towards an observer, the waves are compressed: wavelength decreases, frequency (and thus pitch) increases. When moving away, waves are stretched: wavelength increases, frequency (and pitch) decreases. Amplitude relates to loudness, not pitch, but for the Doppler Effect on pitch, frequency/wavelength are key. For example, a car horn: approaching - higher pitch (shorter $\lambda$, higher $f$); receding - lower pitch (longer $\lambda$, lower $f$).

Answer:

When an object emitting sound moves, the Doppler Effect changes the pitch (perceived frequency) of the sound. Frequency ($f$) and wavelength ($\lambda$) are related by $v = f\lambda$ (where $v$ is the speed of sound in the medium). If the object moves toward the observer, the sound waves are compressed: wavelength $\lambda$ decreases, so frequency $f$ (and pitch) increases (since $v$ is constant for a medium). If the object moves away, the waves are stretched: $\lambda$ increases, so $f$ (and pitch) decreases. Amplitude affects loudness, not pitch, but for pitch - related wave behavior in the Doppler Effect, frequency and wavelength changes drive pitch changes. For example, a moving ambulance siren: approaching - higher pitch (shorter $\lambda$, higher $f$); receding - lower pitch (longer $\lambda$, lower $f$).