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Thermal Radiation. Quantum Nature of Light.

Problem 5.271

A narrow X-ray beam falls on a NaCl single crystal. The least angle of incidence at which the mirror reflection from the system of crystallographic planes is still observed is equal to α=\alpha= =4.1∘.=4.1^{\circ} . The interplanar distance is d=0.28nmd=0.28 \mathrm{nm}. How high is the voltage applied to the X-ray tube?

Reveal Answer
V=πℏc/edsin⁡α=31kVV=\pi \hbar c / e d \sin \alpha=31 \mathrm{kV}
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