## Physics: Principles with Applications (7th Edition)

Published by Pearson

# Chapter 27 - Early Quantum Theory and Models of the Atom - Questions: 12

#### Answer

Yes, its wavelength increases.

#### Work Step by Step

This is known as the Compton Effect (page 780). An X-ray photon that scatters from an electron gives the electron some energy (perhaps knocking it out of the atom) during the collision. The photon loses energy and its wavelength becomes longer, because its energy $E = hf = h \frac{c}{\lambda}$.

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