Question

When a beam of accelerated electrons hits a target, a continuous X-ray spectrum is emitted from the target. Which of the following wavelength is absent in the X-ray spectrum, if the X-ray tube is operating at 40,000 volts.

• A. 0.25 Å
• B. 0.5 Å
• C. 1.5 Å
• D. 1.0 Å

Answer 1

Answer: (A)

0.25 Å

Answer 2

${\lambda\frac{12375}{40,000}}_{\min}$ Hence wavelength less than 0.30 Å is not possible.