All Problems

Thermal Radiation. Quantum Nature of Light.

Problem 5.270

A voltage applied to an X-ray tube being increased η=\eta= =1.5=1.5 times, the short-wave limit of an X-ray continuous spectrum shifts by Δλ=26\Delta \lambda=26 pm. Find the initial voltage applied to the tube.

Reveal Answer
V=2πc(11/η)/eΔλ=16kVV=2 \pi \hbar c(1-1 / \eta) / e \Delta \lambda=16 \mathrm{kV}