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BaLLatris [955]
3 years ago
11

The sound of a police siren that is moving away has (1) _____ wavelengths, and one that is approaching has (2) ______ wavelength

s.
1) a. longer b. higher c. shorter

2) a. lower b. Longer c. shorter
Biology
2 answers:
noname [10]3 years ago
6 0
FIRST one (shorter)

SECOND one (longer)
Papessa [141]3 years ago
5 0
<h3><u>Answer;</u></h3>

A. Longer

C. Shorter

The sound of a police siren that is moving away has <u>shorter</u> wavelengths, and one that is approaching has <u>longer</u> wavelengths.

<h3><u>Explanation;</u></h3>
  • The pitch of the sound heard depends on the frequency of the sound wave. A higher frequency corresponds to a high pitch. Therefore, when the police siren is approaching an observer, the observed frequency increases and thus the observer hears a higher pitch.
  • <em><u>Conversely, when the police siren is moving away from an observer, then the frequency decreases and thus, the pitch of the sound heard is lower.</u></em>
  • <em><u>A higher frequency corresponds to a shorter wavelength, therefore, the shorter the wavelength, the higher the frequency, and the higher the pitch, of the sound.</u></em>
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