Question

what happens to sound waves from an object as it moves toward you? (1 point) the pitch gets higher because of an increase in frequency. the pitch gets lower because of an increase in wavelength the pitch gets lower because of an increase in frequency. the pitch gets higher because of an increase in wavelength

Explanation:

This question relates to the Doppler effect in physics (a subfield of Natural Science). When a sound - emitting object moves toward an observer, the sound waves are compressed. This compression leads to an increase in the frequency of the sound waves. Pitch is related to frequency: a higher frequency corresponds to a higher pitch.

• For the second option, when the object moves toward us, the wavelength should decrease (not increase), and a decrease in wavelength (with constant speed of sound) leads to an increase in frequency, so a lower pitch due to increased wavelength is wrong.
• For the third option, an increase in frequency should lead to a higher (not lower) pitch.
• For the fourth option, an increase in wavelength would lead to a lower (not higher) pitch as frequency and wavelength are inversely related ($v = f\lambda$, where $v$ is wave speed, $f$ is frequency, and $\lambda$ is wavelength) when $v$ is constant.
• The first option correctly states that as the object moves toward you, the pitch gets higher because the frequency of the sound waves increases.

Answer:

The pitch gets higher because of an increase in frequency.