When scattered X-ray photons are observed at θ = 90°, the Compton shift Δλ is equal to
Correct answer: C. full wavelength
- A. Compton shift
- B. Compton wavelength
- C. full wavelength
- D. None
Explanation
Correct. At θ = 90°, the Compton shift is equal to the full wavelength of the incident X-raysIn summary, the correct option is **c. Full wavelength** for the Compton shift at θ = 90°
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Classical physics cannot explain blackbody radiation and related observations, leading to Planck’s quantum theory, in which energy is emitted or absorbed in discrete packets. Photons provide the particle model of light, with energy and momentum linked to frequency and wavelength, including the photoelectric effect and its threshold frequency.
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