Which of the following is not a target metal used in Coolidge tube?
A. Rhodium
B. Cobalt
C. Gold
D. Silver
Answer:C
Which of the following is not a target metal used in Coolidge tube?
A. Rhodium B. Cobalt C. Gold D. Silver
Explanation: Gold is not used as a target metal in Coolidge tube. The other target metals are copper, molybdenum and chromium.