Question

One of the following wavelengths is absent and the rest are present in the X-rays coming from a Coolidge tube. Which one is the absent wavelength?
(a) 25 pm
(b) 50 pm
(c) 75 pm
(d) 100 pm

Answer 1

The absent wavelength of Coolidge tube is 25 pm.

Explanation:

• The cut off wavelength of 50 pm, 75 pm and 100 pm are present wavelength.
• 25 pm is the minimum cut off wavelength which is an absent wavelength.

Coolidge X- ray tube

• William Coolidge, invented this tube in 1913.
• It is high vacuum and the electron source used as a heated filament.
• In the x ray production, gas in the tube is not involved and not like the situation with cold cathode discharge tube.
• The energy and intensity of the x rays can be independently controlled.
• The cathode current increases then the temperature increases.
• Stability is the advantage for the Coolidge tube.

To learn more;

1. https://brainly.in/question/7678428
2. https://brainly.in/question/8029730