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Pitch up or pitch down?

Exercise and reference answers

Left
Higher pitch
Items
  1. Item
    Source approaches
    Answer
    Higher pitch
  2. Item
    You walk toward it
    Answer
    Higher pitch
  3. Item
    Source moves away
    Answer
    Lower pitch
  4. Item
    Waves bunch up
    Answer
    Higher pitch
  5. Item
    You walk away
    Answer
    Lower pitch
  6. Item
    Waves spread out
    Answer
    Lower pitch
  7. Item
    Shorter wavelength
    Answer
    Higher pitch
  8. Item
    Longer wavelength
    Answer
    Lower pitch
Right
Lower pitch
Instructions
Swipe each situation to the pitch the listener hears.

Explanation

_Source: OpenStax Physics (high school, CC BY 4.0), Ch 14 "Sound", section 14.3 Doppler Effect and Sonic Booms_
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