Question

The minimum wavelength of X-rays produced in a coolidge tube operated at potential difference of 40 kV is

• A. 0.31Å
• B. 3.1Å
• C. 31Å
• D. 311Å

Answer 1

Answer: (A)

0.31Å

Answer 2

${\lambda\frac{12375}{40 \times 10^{3}}}_{\min} \approx 0.31\mspace{6mu} Å$