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Sound Wave Phenomena Quick Check

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Question
Use the images to answer the question.

The images show the pressure waves created by a passing sound source.

The compactions and rarefactions are at a larger distance in the pressure wave in the air for a low-pitched sound than in a high-pitched sound. Also, the number of compactions and rarefactions is more in a high-pitched sound.

Which image corresponds to what moment in time?

(1 point)
Responses

The low-pitched sound corresponds to the sound source moving away; its wavelength is shorter. The high-pitched sound corresponds to the sound source getting closer; its wavelength is longer.
The low-pitched sound corresponds to the sound source moving away; its wavelength is shorter. The high-pitched sound corresponds to the sound source getting closer; its wavelength is longer.

The low-pitched sound corresponds to the sound source getting closer; its wavelength is longer. The high-pitched sound corresponds to the sound source moving away; its wavelength is shorter.
The low-pitched sound corresponds to the sound source getting closer; its wavelength is longer. The high-pitched sound corresponds to the sound source moving away; its wavelength is shorter.

The low-pitched sound corresponds to the sound source getting closer; its wavelength is shorter. The high-pitched sound corresponds to the sound source moving away; its wavelength is longer.
The low-pitched sound corresponds to the sound source getting closer; its wavelength is shorter. The high-pitched sound corresponds to the sound source moving away; its wavelength is longer.

The low-pitched sound corresponds to the sound source moving away; its wavelength is longer. The high-pitched sound corresponds to the sound source getting closer; its wavelength is shorter.

1 answer

To analyze the scenario presented with sound waves, we need to consider the characteristics of low-pitched and high-pitched sounds, as well as the Doppler effect:

  1. Low-pitched sounds have longer wavelengths and are represented by fewer compactions and rarefactions in a given distance.
  2. High-pitched sounds have shorter wavelengths, resulting in more compactions and rarefactions in the same distance.
  3. When a sound source moves away from the observer, the sound waves are stretched out, leading to a lower frequency (lower pitch), while when it approaches, the wavelengths are compressed, leading to a higher frequency (higher pitch).

Given the options and the information provided, here’s the right interpretation:

  • If a low-pitched sound is observed while the sound source is moving away, it has a longer wavelength.
  • Conversely, if a high-pitched sound is observed while the sound source is moving closer, it has a shorter wavelength.

Therefore, the correct response is:

The low-pitched sound corresponds to the sound source moving away; its wavelength is longer. The high-pitched sound corresponds to the sound source getting closer; its wavelength is shorter.