## College Physics (4th Edition)

(a) The frequency of the EM radiation is $1.5\times 10^{18}~Hz$ (b) This EM radiation lies in the X-ray part of the EM spectrum.
(a) We can find the frequency of the EM radiation: $f = \frac{c}{\lambda}$ $f = \frac{3.0\times 10^8~m/s}{0.20\times 10^{-9}~m}$ $f = 1.5\times 10^{18}~Hz$ The frequency of the EM radiation is $1.5\times 10^{18}~Hz$ (b) Since a frequency of $10^{18}~Hz$ is in the middle of the range for X-rays, this EM radiation lies in the X-ray part of the EM spectrum.