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

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

1 answer

To determine which statement is correct, we need to consider the relationship between pitch, wavelength, and the Doppler effect.

  1. Low-pitched sounds have longer wavelengths and are produced by lower frequency vibrations. When the sound source is moving away from an observer, the wavelength appears longer (due to the Doppler effect).

  2. High-pitched sounds have shorter wavelengths and are produced by higher frequency vibrations. When the sound source is moving towards an observer, the wavelength appears shorter (again due to the Doppler effect).

Given this understanding:

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

Therefore, the correct matching based on the explanations provided 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.