Question 36

Sound waves that are closer together have a higher pitch.

When sound waves are closer together, they exhibit a higher frequency, resulting in a higher pitch. This phenomenon is described by the Doppler Effect, where the frequency of sound waves changes based on the relative motion of the source and the observer.

A) Sound waves that are closer together

This option is correct. According to the Doppler Effect, when sound waves are compressed as the source approaches an observer, they are closer together, leading to a higher frequency and, consequently, a higher pitch.

B) Sound waves that are farther apart

This option is incorrect. Sound waves that are farther apart correspond to a lower frequency, which results in a lower pitch. The Doppler Effect explains that as the source of sound moves away, the waves stretch out, making them less frequent and thus lower in pitch.

C) Sound waves that travel a long distance

This option is incorrect. The distance traveled by sound waves does not directly affect their pitch. Instead, it is the frequency of the waves that determines pitch, and traveling a long distance does not inherently mean the waves will be closer together or farther apart.

D) Sound waves that travel a short distance

This option is also incorrect. While sound waves traveling short distances can be closer together, the distance itself does not dictate the pitch. The relationship between the movement of the sound source and the listener is what affects the frequency and pitch of the sound.

Conclusion

In summary, sound waves that are closer together result in a higher pitch due to their increased frequency, as described by the Doppler Effect. All other options fail to accurately relate the spacing of sound waves to their pitch, making Option A the definitive correct choice. Understanding the relationship between wave frequency and pitch is essential to grasping the concepts of sound and its perception.