Soft X–rays and Hard X–rays

Soft X–rays and Hard X–rays
X–rays  are  of  two  types-

•  Soft  X–rays  
• Hard  X–rays

Soft  X–rays
X–rays  having  wavelength  of  4Å  or  above,  have  lesser  frequency
and  hence  lesser  energy.  They  are  called  soft  X  –  rays  due  to  their  low
penetrating  power.  They  are  produced  at  comparatively  low  potential
difference.

 Hard  X–rays
X–rays  having  low  wavelength  of  the  order  of  1Å have  high
frequency  and  hence  high  energy.  Their  penetrating  power  is  high,
therefore   they   are   called   hard   X–rays.   They   are   produced   at
comparatively  high  potential  difference.
The wavelength of X–rays depends upon the kinetic energy of the
electrons  producing  them  and  this  kinetic  energy  depends  upon  the
potential  difference  between  the  filament  and  the  target.