[填空题]
If the shortest-wavelength bremsstrahlung dmowzd 5*f a, y.w wg*)2h:metX-rays emitted from an X-ray tubltyp9-h-x5lrmqrw )x i.fsp ,6a86hl e have a 6r ph5.6f sylx9tm) q-wxl8,pih-rl$\lambda=0.030 \, \text{nm}$, what is the voltage across the tube? kV
