The Compton effect mattered because it showed radiation is not purely a:
AWisp
BWick
CWave
DWire
Answer & Solution
Correct answer: C. Wave
1. The shift needed particle collisions.
2. Waves alone could not explain it.
3. So radiation is not purely a wave.
_Source: OpenStax University Physics Volume 3, Chapter 6, Photons and Matter Waves._
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