The wavelength of the $K_{\alpha}$ $X$-ray produced by an $X$-ray tube is $0.76 \ \mathring{A}$. The atomic number of the anode material is ...

If a voltage applied to an $X$-ray tube is increased to $1.5$ times, the minimum wavelength $(\lambda_{\min})$ of an $X$-ray continuous spectrum shifts by $\Delta \lambda = 26 \, pm$. The initial voltage applied to the tube is:

For continuous $X-$rays,the minimum wavelength produced is:

For the production of characteristic $K_{\gamma}$ $X$-ray,the electron transition is:

If $X$-rays pass through a strong magnetic field,the $X$-rays . . . . . .

If $\lambda_{Cu}$ is the wavelength of the $K_{\alpha}$ $X$-ray line of copper (atomic number $Z = 29$) and $\lambda_{Mo}$ is the wavelength of the $K_{\alpha}$ $X$-ray line of molybdenum (atomic number $Z = 42$),then the ratio $\frac{\lambda_{Cu}}{\lambda_{Mo}}$ is close to: