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X rays scattered from a material come back with a longer wavelength. That is the:

ACompton effect
BCoriolis effect
CCasimir effect
DCoanda effect
Answer & Solution
Correct answer: A. Compton effect
1. The scattered photon lost energy. 2. Lower energy means longer wavelength. 3. That is the Compton effect. _Source: OpenStax University Physics Volume 3, Chapter 6, Photons and Matter Waves._
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