JEE Main & Advanced
Physics
Photo Electric Effect, X- Rays & Matter Waves
Question Bank
X Rays
question_answer
The binding energy of the innermost electron in tungsten is 40 keV. To produce characteristic X-rays using a tungsten target in an X-rays tube the potential difference V between the cathode and the anti-cathode should be [IIT 1985]
A) V< 40 kV
B) V \[\le \] 40 kV
C) V > 40 kV
D) V >/< 40 kV
Correct Answer:
C
Solution :
Applied voltage must be greater than binding energy.