In radiotherapy,$X$-rays are used to

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 ...

Fraunhofer lines of the solar system are an example of

If the wavelength of the $K_\alpha$ line of Molybdenum (atomic number $Z = 42$) is $0.7078\, \mathring A$,then the wavelength of the $K_\alpha$ line of Zinc (atomic number $Z = 30$) is .......

In the characteristic $X$-ray spectra of an atom superimposed on a continuous $X$-ray spectrum, identify the peaks $P$ and $Q$ shown in the graph.

An electron having de-Broglie wavelength $\lambda$ is incident on a target in an $X$-ray tube. The cut-off wavelength of the emitted $X$-ray is: