Electrons striking the screen of a television set are accelerated through 2.0 kV. What is the minimum wavelength of the X-rays they produce?
Correct answer D. 6.2 × 10⁻¹⁰ m
Explanation
The shortest wavelength occurs when an electron's full kinetic energy becomes one photon: λ = hc/eV = (6.63 × 10⁻³⁴ × 3 × 10⁸)/(1.6 × 10⁻¹⁹ × 2000), about 6.2 × 10⁻¹⁰ m.
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