The scattering angle for which the Compton shift in wavelength is equal to Compton wavelength is:
Correct answer: A. 0=90°
- A. 0=90°
- B. 0=0"
- C. 0=45°
- D. 0=180°
Explanation
COMPTON'S EFFECT: It is the scattering of a high-frequency photon after a collision with an electron, which results in a decrease in the wavelength of the photon. The change in wavelength is called Compton's shift and is given by: λ′−λ=hmₒc(1−cosθ). The factor hmₒc is known as compton's wavelength. The compton's shift and compton's wavelength will be equal when the factor (1−cosθ) is equal to 1. Now cos should be equal to 1, and for that, θ should be 90°. Thus, option 'A' is the right answer.
This question appeared on the ETEA MDCAT 2011 paper, which you can sit online with every answer explained.
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The particle model treats light as photons with energy E equals hf and momentum related to wavelength. Questions involve the photoelectric effect, work function, threshold frequency, stopping potential and photon energy, while distinguishing particle behaviour from the wave description of interference and diffraction.
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