Question

In an $X-$ray tube the acceleration voltage is $20kV$. Two targets $A$ and $B$ are used one by. For $A$ the wavelength of the $K_a$ line is $62pm$. For $B$ the wavelength of the $L_a$ line is $124pm$. The energy of the $B$ ion with vacancy in ${}^{\prime }{M}^{\prime }$ shell is $5.5keV$ higher than the atom of$B$.[Take $hc=12400eV\mathring{A}$]

• A. Value of ${\lambda }_{min}$ is $0.62\mathring{A}$.
• B. $A$ will emitte $K_a-photon$
• C. $A$ will emitte $L-photons$
• D. minimum wavelength (in $\mathring{A}$) of the characteristic $X-$ray that wil be emitted ${}^{\prime }{B}^{\prime }$ is $0.8A$

Answer 1

Answer: (A), (C), (D)

The correct options are
A Value of ${\lambda }_{min}$ is $0.62\mathring{A}$.
C $A$ will emitte $L-photons$
D minimum wavelength (in $\mathring{A}$) of the characteristic $X-$ray that wil be emitted ${}^{\prime }{B}^{\prime }$ is $0.8A$