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Faster or slower sound?

Exercise and reference answers

Items
  1. Group
    Faster
    Item
    More rigid
  2. Group
    Slower
    Item
    More dense
  3. Group
    Faster
    Item
    Hard to squash
  4. Group
    Slower
    Item
    Squashes easily
  5. Group
    Faster
    Item
    Steel rail
  6. Group
    Slower
    Item
    Open air
  7. Group
    Faster
    Item
    Liquid water
  8. Group
    Slower
    Item
    Thin gas
Groups
  1. Item
    Faster
  2. Item
    Slower
Instructions
Steer each falling change onto its effect. Alike ones merge and grow.

Explanation

_Source: OpenStax Physics (high school, CC BY 4.0), Ch 14 "Sound", section The Speed of Sound_
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