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Question
State the effect of the following changes on the X-rays emitted by Coolidge X-ray tube :
(i) High voltage between cathode and anode is increased.
(ii) Filament temperature is increased.
Solution
(i) We know,
`lambda = 1.22/sqrt"V" Å`, where V is the accelerating potential in volt.
If V increases wavelength λ will decrease i.e., harder X-rays will be produced.
(ii) When the temperature increases, the number of electrons emitted by the filament increases. As a result, the intensity of X-rays increases.
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RELATED QUESTIONS
Using the constants given on page 8 ofthis·Paper, find the minimum wavelength of the emitted X rays, when an X-ray tube is operated at 50 kV.
(i) Find the maximum frequency of X-rays produced by an X-ray tube operating at a tube potential of 66 kV.
(ii) State any one difference between characteristic X-rays and continuous X-rays.
