The scattering angle for which the Compton shift in wavelength is equal to the Compton wavelength is
Correct answer: A. 90 degrees
- A. 90 degrees
- B. 0 degrees
- C. 45 degrees
- D. 180 degrees
Explanation
When the change in wavelength equals the Compton wavelength, the scattering angle is 90 degrees.\[ \lambda' - \lambda = \frac{h}{m_e c}(1 - \cos(\theta)) \]\[ \cos(\theta) = 1 \Rightarrow \theta = 90^\circ \]
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About Dawn of Modern Physics
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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