The minimum wavelength of X-rays produced by the bombardment of electrons on the screen of a television set where the accelerating potential is 2.0K V will be______________?
Correct answer: A. 6.2 x 10^-10m
- A. 6.2 x 10^-10m
- B. 9.1 x 10^-18m
- C. 3.11 x 10^-10m
- D. 4 x 10^-10m
Explanation
The minimum wavelength is λ_min = hc/eV = (6.63 x 10^-34 J s)(3.0 x 10^8 m/s)/(1.60 x 10^-19 C)(2000 V) = 6.2 x 10^-10 m. The likely mistake is 3.11 x 10^-10 m, which results from using an incorrect numerical value or mishandling the accelerating voltage.
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About Photons and the Particle Model of Light
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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