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ARC-Easy / Mercury_7200200 / Elizabeth uses a specific type of whistle to call her dogs. The noise made by…

Problem

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question

Elizabeth uses a specific type of whistle to call her dogs. The noise made by the whistle is heard by the dogs but cannot be heard by the human ear. Which statement best describes why humans cannot hear the sound made by the whistle?

choices

  • The speed of the sound is too fast.
  • The amplitude of the sound is too low.
  • The frequency of the sound is too high.
  • The wavelength of the sound is too long.

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Source and history

Official source

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