A) A suitable target material must have a high melting temperature
B) A suitable target material must have low thermal conductivity
C) The average rate of rise of temperature of target would be 2 °C/s
D) The minimum wavelength of the X-rays emitted is about \[0.25\times {{10}^{-10}}\,m\]
Correct Answer: C
Solution :
\[P=VI=50\times {{10}^{3}}\times 20\times {{10}^{-3}}=1000\,\,W\] Power converted into heat = 990 W \[ms\Delta T=990\,\Rightarrow \Delta T={{2}^{o}}C/\sec \] Now \[\frac{hc}{{{\lambda }_{\min }}}=eV\]\[\Rightarrow \,{{\lambda }_{\min }}=\frac{hc}{eV}=0.248\times {{10}^{-10}}m\]You need to login to perform this action.
You will be redirected in
3 sec