Question $1$

$3$ pts

The key feature$($s$)$ of $x-$ray spectra are:

series of peaks spaced in wavelength as $\frac{1}{n^2}$ that correspond to photoexcited electrons.

broad feature due to bremstrahlung radiation and few sharp peaks due to characteristic radiation

$1/$lambda dependence due to energy distribution of bombarding electrons

contineous intensity due to nonmonochromatic nature of $x-$ray radiation.