Question

Which of the following wavelength will be absent from the X-ray spectrum if the X-ray tube is operated at 40,000 V?

• A. $0.2A^{\circ }$
• B. $0.5A^{\circ }$
• C. $1.0A^{\circ }$
• D. $2.0A^{\circ }$

Answer 1

The correct option is A $0.2A^{\circ }$

${\lambda }_{min}=\frac{hc}{eV}$
Substituting values we get ${\lambda }_{min}=0.3angstrom$ and hence a wavelength of 0.2 angstrom is not possible.